So, I've been thinking

[04silveradomykk]

I've had my heart set on a LS2 swap for a day in the distant future... something about opening the hood of a truck to see the red corvette engine covers & LS intake runners. But that is a expensive swap with expensive parts and expensive to mod. And unless I win the lottery or inherit millions from a long lost relative it isn't a reality

A more realistic V6 to V8 swap (for my year) would be the Vortec 350 still sporting the 96-97-98-99 vortec fuel injection. Wich is practically identical to the 2004 4.3L fuel injection plus 2 more cylinders/injectors. it's strange to go backwards a few years in engine but practical. look at it this way, the stock 4l60E will work, the 4.3L torque conveter will add an advantage to the 350. The stock 4.3L motor mounts will work, unlike the LS based v8's. The 4.3L accesories & pulleys will work on the vortec 350. And I personally have already ditched the mechanical fan for dual electrics.

In it's stock form the vortec 350 wouldn't be worth the $$ and time. I think it only makes 50 more HP and 40 more TQ than the 2004 4.3L. However, GM has a crate 350horse vortec 350... and there are even stroker kits, and cam kits to be had for cheap(er). 350-400Hp is completely realistic and that pushes the limits of the vortec fuel injection.

So let me ask you guys this (those of you who swaped to a vortec 350) was it as easy as adding four more wires for two more injectors + a comp tune and whatever exhaust work?

Cheers ~Mykk

[Bone Crusher]

Obviously you have done some homework on this Mykk and I think in about 2 years I will be financially sound for a swap. Not to highjack this thread, but to add to his question, what are the costs as well to doing an LS swap compared to what Mykk is talking about with the 350 crate?

[rentedmule]

I don't have anything useful to add as far as the logistics of the swap go but I have been paying attention to the cost of LS1-2 motors for the last while and they can be crazy - $5 grand+ for the engine alone and closer to $9K for a low mileage engine/tranny/wiring combo.

like you said Mykk, the great thing about the vortec 350 swap is that the aftermarket is huge. a stock motor may only have a few more ponies than your 4.3 but the potential for big/cheap power is there

[holsinger17]

ever think about finding one of you trucks that have the 8 in it possible wrecked....you can try going to a salvage auction..i know that there are a few HD's at my insurance companies lot waiting to be put in the auction both have the big block...i cant remember the litres but i do rember that they are equal to a 496

[boxcarracer963]

ever think about finding one of you trucks that have the 8 in it possible wrecked....you can try going to a salvage auction..i know that there are a few HD's at my insurance companies lot waiting to be put in the auction both have the big block...i cant remember the litres but i do rember that they are equal to a 496
8.1, that would be pretty cool to put that in...it would be like a newer version of the Silverado 454 SS, Silverado 496 SS lol...

[bespurcell]

This doesn't really answer your question but,http://www.s10planet.com/forum/showthread.php?t=10067

[00S104.3]

.........So let me ask you guys this (those of you who swaped to a vortec 350) was it as easy as adding four more wires for two more injectors + a comp tune and whatever exhaust work?

Cheers ~Mykk

I haven't done the swap but have thought of it many times. You can get your stock wire harness modified(adding the extra wires for 2 more cylinders) or get a new one made for the new engine. Here is a link to current performance wiring.....http://www.currentperformance.com/

I don't know if this is what your looking for but I thought I'd share.

[04silveradomykk]

I'm here at the auto parts store that I manage, and I have up on my split screen in the cataloging of the computer system a 2004 Silverado 4.3L and a 1998 Chevy 1500 5.7L

the ignition controle module
crank position sensor
magnetic pick-up/cam position sensor
throttle position sensor
IAC motor
coolant temp sensor

...Are all the same exact part number between both years & engines. For the exception of the Knock Sensor all computer interface sensors/controls are the same.

[C4Tom]

Man... that would be almost perfect... try finding a wrecked silverado V8 and just do the straight swap. I would use computer and all sensors. As far as the computer goes... it would essentially think it was in the same vehicle.

[holsinger17]

if you do a full swap wiring computer and all...that would be pretty sweet, you could have a decent setup with dependability and all

[04silveradomykk]

So how's this sound?
Starting with a L31 vortec 350 block

http://bpi.ebasicpower.com/engines/eagle/images/EagleVortecRem1.jpg

boring the block .030" over, and notching the cylinder walls for rod bolt clearance and installing a 383ci stroker kit

http://static.summitracing.com/global/images/prod/large/esp-b13052l030_w.jpg

a big cam, like the Comp Cams CS XR294HR-10. 242int/248exh duration, .540"int/.562" valve lift @ w/ 1.5 ratio rockers. 110 degrees lobe seperation

http://static.summitracing.com/global/images/prod/large/cca-k12-422-8_w.jpg

Edelbrock E-Tec aluminum vortec heads. 2.02" intake / 1.6" exhaust valves, 64cc chambers, 200cc intake runner volume & 78cc exhaust runner volume

http://static.summitracing.com/global/images/prod/large/edl-60989_w.jpg

Retaining the Vortec 350 fuel injection, but instead using the Marine Vortec 350 FI with 27lb/hr injectors. That way I can use my CFM-tech 75mm throttlebody too

http://img.photobucket.com/albums/v35/hquick/Mercruiser%20Marine%20Manifold/P8260032.jpg

I can also use my adapted carb scoop on the vortec 350 too...ha
we're already at $2500.00 in parts, not including the cost of engine and machine shop labor. And there are still several hundreds of dollars in loose ends left.... one can dream right?

[Cameo_S10]

Those pics are like looking at playboy for gearheads like us. Sweeeeeeet!:D The full wreck swap would be the cheapest and easiest tho.:cool:

[lucy_blue_93]

Those pics are like looking at playboy for gearheads like us. Sweeeeeeet!:D The full wreck swap would be the cheapest and easiest tho.:cool:

X2. and since youre practically rebuilding hte entire motor, it wont matter about it being used. i would go that route. keeps from havin to pay 2 or 3k for a new motor to tear into and all that stuff go to waste. maybe youll get lucky and find a motor with some stuff already done to it.

[Hammer Head]

It'd be cheaper & you'd get more power from an LSx, IMO. Whichever you decide is obviously your opinion.. but.. yea..

[firefighter]

I concur the way you wanna approach it will get your foot in the door with an LSx. LS1's are getting dirt cheap but you'll have to go through it, LS2's are still kind of high but that will start to change now that the LS3's are out. Also if you can get your hands on an LQ9 (6.0L) and maybe throw some good power parts at it it would be way fun. I just wanted to stay away from the iron blocks for my application which drives up the price and has led me to go to the Blower plan I got going. But I still would love to do the LS2/M6 swap.

[Blazer69]

crate motor....just go with the 572 though...lol

[Mikz86TA]

Personally I like the Tq and flat powerband feel of the LS2. I drove a LS1 also B4 with a auto/3.42s and it had the same flat powerband feel to it. But it just wasnt as strong. Seemed to have more lower-end control tho than the LS2 I drove. The LS2 I drove is my buds GTO with the M6 and 3.42s. That car I can start out in 3rd no worries. My 1st time getting on it, I was 'controlled' but all over the place. And TracCont was ON! Doing 120 in it was like no bodys business and there was still pull...even in 6th. YIKES!

[Hammer Head]

Whenever I get back up to WI I'll be gettin a 4.8 LSx, mostly for parts.

[Mikz86TA]

A 4.8 in a S10 honestly would be enough. Id be OK with that....so would my right foot =)

[Hammer Head]

4.8 & 5.3s use the same block. The 5.3 uses the 5.3/5.7/6.0 crank. You could bore the 4.8/5.3 block (iron blocks) out to the 5.7's bore & then use 5.7 pistons to arrive at the same 5.7 LS1.. but w/ a Z06 cam or even the cam found in the SS camaro, w/ the .500/.500 lift, the 4.8 is almost equal in power.. so what would the point be to spend all the extra cash to do the conversions to build a 5.7 from the 4.8/5.3 block when only about 20 hp can be found in it? Still making about 310hp from a 4.8 w/ a good cam.

[Hammer Head]

The upgrade to the 5.3 rotating assembly from the 4.8s' only equates to about 2-5hp increase.. but there is more torque. Maybe about 25-30ft/lbs. Still not really worth the extra cost. And when the 5.7 conversion is done you should change the heads or else you'd have an outrageous compression ratio.

[rockstar9]

what about a crate engine? edelbrock for example. would that be just as expensive to swap?

[Hammer Head]

What kind of Edelbrock engine? All the ones I've seen are the SBC which would require a lot of mods to run the emissions & all the electrical in the truck.. BCM, PCM, etc.. not worth the hassle IMO & it comes out to almost the same price.

[rockstar9]

Well I was just looking at the crate engines on the Edelbrock website. Nothing in particular. I just want my S10 to have more power and am having a lot of trouble finding performance parts for my truck. So I figured a V8 swap was the way to go.

[87wildside]

Whenever I get back up to WI I'll be gettin a 4.8 LSx, mostly for parts.....and I get the rest?:)

[Blazer69]

maybe an ls9 would be an idea? lol

[Blazer69]

why wait till u come back to wi?

[Hammer Head]

Because the 4.8 is sittin in my cousin's garage.. I'm trading some parts for it. I'd like a little '60s chevy/GMC van (pre-'68) & drop in the 4.8 & caddy the lights.. just something to run back & forth to work & tote my s10 parts & tools around. I may pull off some stuff & sell it.. & when I drop the 6.0 in the truck I'll sell the 4.3, too.

[04silveradomykk]

Ok guys. School me. I got the ball rolling on Project 383ci swap in my 2004 Silverado.

I decided on the 383ci obviously for power reasons, but also to justify the L31 swap. And to have a unique GMT800 truck rolling around that has a 383 small block in it.

I'm not here to debate why I'm not swaping for a LS/LQ based motor... frankly, it just comes down to cost and parts already available. A 383ci stroked small block chevy in a reg cab short bed GMT800 will actually be pretty cool, and different.

So here is what I've got, a complete 4 bolt main L31 core in full dress including the 96-99 vortec fuel injection minus wiring harness & computer. I can have the 383 stroker/rebuild kit & any roller cam of my choice in my hands in less than a day and I can have all of the block & head machine work done in a week.

All of my accesories, brackets, serp system, sensors, throttlebody & intake will be transfered over from my current 4.3L

What do I need to modify specifically (Pins) on my current trucks harness to accomodate two extra injectors?

What do I need to change with HPTuners to allow my current PCM to control the V8?

What do I do about motor mounts? the v8 has a 4" difference in location compared to a 4.3L. And the GMT800 has a different style motor mount from an S series too so the conversion mounts wont work. I don't mind fabrication something up.

I am already checking out v8s10.org and reading what other guys are doing.

Help!

[Zygoat]

well about the only place i can help is the programming. you will probably just have to re flash with a tune from a pcm with that motor and tranny combo, and frankly thats about it, you should be rolling.

on the motor mounts. just get the steel out.

[12sws27]

How 'bout this crate engine? 340hp @ 4500rpm / 435tq @ 3600rpm

http://www.jegs.com/p/GM+Performance/764049/10002/-1/10763

I would love to put this in a 2nd gen 2dr blazer

[04silveradomykk]

How 'bout this crate engine? 340hp @ 4500rpm / 435tq @ 3600rpm

http://www.jegs.com/p/GM+Performance/764049/10002/-1/10763

I would love to put this in a 2nd gen 2dr blazer

It will be alot like that, but for a fraction of the cost. And a bigger cam so it can breath above 4500rpm.

[04silveradomykk]

well about the only place i can help is the programming. you will probably just have to re flash with a tune from a pcm with that motor and tranny combo, and frankly thats about it, you should be rolling.

on the motor mounts. just get the steel out.

I have HPtuners and I suppose I could download a vortec 350 tune from the repository and mimic the engine parameters in my tune...

[Hammer Head]

You may be able to use the motor mounts from a '96-99 Vortec (305/350) & have them line up (chassis & engine sides).

[04silveradomykk]

You may be able to use the motor mounts from a '96-99 Vortec (305/350) & have them line up (chassis & engine sides).

I looked into it. The 96-99 GM trucks had different cross members thus different mounts.

[Hammer Head]

Well then.. why not take the LSx to SBC mounts (that bolt to the block sides) companies are selling & run them 180* (swap passanger side for drivers & visa-versa)? That would make up the difference if you used the LSx mounts. If not I've got a set of SBC in an astro (4.3) block side mounts here. Just do the same thing.. flip 'em to the other side. Since they center the engine it wouldn't matter what side they're on either.

[04silveradomykk]

Well then.. why not take the LSx to SBC mounts (that bolt to the block sides) companies are selling & run them 180* (swap passanger side for drivers & visa-versa)? That would make up the difference if you used the LSx mounts. If not I've got a set of SBC in an astro (4.3) block side mounts here. Just do the same thing.. flip 'em to the other side. Since they center the engine it wouldn't matter what side they're on either.

I'd have to see what they look like, I'm not familiar with that mount.

[Hammer Head]

LSx engine to SBC frame.

http://www.hotrodhotline.com/nuprod/assets/images/welderseries2.gif

How to make them.. http://matt.undiagnosed.org/ls1/imag...ount_plate.jpg (http://matt.undiagnosed.org/ls1/images/engine/ls1_motor_mount_plate.jpg)

[Hammer Head]

Here's the set I have for swapping a V8 into an astro..

[04silveradomykk]

Thanks Hammer Head, after seeing that plate. If everything will line up, I could use stock 4.8/5.3 motor mounts with the plate to the motor mount provisions on the SBC... and even than, if it won't line up I could use the same idea to make my own plates that will work.


::Monster Garage Voice:: FREEBIE!

Yesterday one of my customers told me to come over to pick up a motor he wanted out of his shop and gone. So this morning I get there, and it's a TBI LO5 350, bored .030" over with a .010"/.010" crank. 4 bolt main, one piece rear, roller cam block (with a flat tappet cam in it, strange)

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/engine003.jpg

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/engine002.jpg

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/engine001.jpg

He says, the owner of this motor took off the TBI and ran a carb. He jetted the carb so low that it was consistantly running lean & hot and the rings fried. I will pull it apart and check out the condition of the block. If the cylinder walls look ok and I can't find any cracks after a vat & mag I figured I'd use the block with my vortec heads for the 383ci build, whats the biggest over bore and still be safe to displace heat on a daily driver? .060"? a 4.060" bore with a 3.75" crank & 5.7" rods would be 388ci / 6.4L small block chevy. Yikes.

Does anyone know if the Vortec 4.3L plastic timing chain cover with the crank position sensor will fit a SBC? One would think so.

Cheers ~Mykk

P.S. Am I the only one that thinks that OE centerbolt stamped tin valve covers are god awful ugly.... I wish someone made the composite centerbolt 4.3L valve covers for SBC.

[Mikz86TA]

The timing covers have different mounting holes dont they? The 4.3 has fewer than the SBC and older 4.3s to my knowledge.
.060 is probably the safest and largest overbore.
Nice score!

Wheres your rollpan?

[04silveradomykk]

Wheres your rollpan?

Need to get anew one, someone backed into it.

[04silveradomykk]

Got that motor in the shop and on a stand. It ain't fun moving a complete long block by yourself!

I just set the Vortec fuel injection on the engine, the vortec heads are under the motor on the ground. I pulled the rear crank seal plate off before mounting the engine, and discovered that the crank had a speedi-sleeve on it... good thing I'm going with a new stroker crank.

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/motor.jpg

The block casting is 14093638. 87-95 4 bolt, one piece, and someone drilled for a mechanical fuel pump.

The TBI heads on there are 10110810's and have the swirl port intakes, great for torque. Not meant to breathe above 4500rpm. They will be for sale soon, after I see if there is any significant warpage and condition of the guides & seats.

[04silveradomykk]

This motor already has a balanced rotating assembly. I need to do some investigating and see what all this is.

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/truck020.jpg

Maybe I'll get lucky and this will already be a stroker crank. (Although I didn't see any notched cylinder walls.)

EDIT: the rods & caps are numbered from whenever this rebuild was done... 2 & 4 are switched. According the machine shop who did the original work, that shouldn't matter. As long as I use new bearings when I put it back together I can put the rods back in order.

[04silveradomykk]

pulled the TBI heads off... the deck surface was in good condition. I could see where the head gasket blew. But I couldn't get a .002" feeler gauge under a straight edge anywhere on the decks. The pistons say 345NP .030, and there aren't any ring ridges, scuffs or marks on the cylinder walls. But I'll be deffinent once I get those pistons out of there.

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/motor2.jpg

[04silveradomykk]

Came to work an hour before my shift this morn to keep tearing this motor down.

Sombody did a little cam in this thing. According to my Enginetech catalog, the cam is stage II high performance - 214/224 duration, .295/.310 lift, 107/117 lobe sep.

Cyl #5 had an exploded piston, the ring valley is toast. And although the cylinder walls didn't get damaged.. there are few nicks. I'm thinking of just having the block bored to .040" and calling it good. the block has been decked & line honed before I got it.

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/piston5.jpg

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/cyl5.jpg

If I just retain my current rotating assembly, throw new bearings at it and new .040" over pistons & rings I could call it good. For cheap, and still have a 357ci small block... I dunno, I'm torn and broke. :confused:

And now I'm realizing I probably shouldn't use a gear drive with a plastic timing cover :mad:

[04silveradomykk]

Pistons are on order. Hi-Tech brand Swirl/Quench pistons. Pretty crazy design, it has a ramp in the piston to swirl the air/fuel mix in the cyl and it has a dimmpled top to evenly disperse heat through the entire piston.

my 64cc vortec heads will create a 9.71 compression ratio with this piston.

http://images.chevyhiperformance.com/techarticles/p173614_image_large.jpg

To learn more about why I chose this piston check out

http://www.chevyhiperformance.com/tech/engines_drivetrain/shortblock/94138_piston_head_clearance_guide/index.html

Cheers ~Mykk

[bespurcell]

Those pistons look sweet!

[04silveradomykk]

Wishful thinking.

Just a few minutes left on the clock till the end of the work day. The phones have stoped ringing, and I figured I'd mock up the engine with a duplicolor rebuild... nevermind the peremeter bolt valve covers on center bolt heads. :rolleyes:

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/soonII.jpg

['94 Big Blaze]

heheh awesome...i think summit sales a kit that lets you use perimeter vavle covers on centerbolt heads.

[04silveradomykk]

the Desktop Dyno estimated output for a .040" vortec 350, stock crank, with head work and a 260HR cam.

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/untitled.jpg

That's pushing the horsepower envelope for that design of fuel injection anyways. I don't know about you but I can live with that kind of power from a daily driver and still maintain 17-24mpg

[rentedmule]

Those kind of numbers make me think a swap like that is a great alternative to an LSx

[Bone Crusher]

Mykk,

Just curious about that desktop dyno...If you get some free time I was wondering if you could throw the old '02 4.3L on there with air intake and the 266ahr cam, 1.52 roller rockers with before and after header install....getting kind of ampped for my cam install and maybe headers to take place. Really hope I get a solid 30-40 horse out of this to make up for the wynjammer not being on my truck anymore

BTW those numbers look good considering a huge cost to hp ratio b/w that and the LSx

[04silveradomykk]

Mykk,

Just curious about that desktop dyno...If you get some free time I was wondering if you could throw the old '02 4.3L on there

How about you do your own ;)

I threw the dyno ZIP file on a host a while back. :cool:

http://www.mediafire.com/download.php?8j4savbwlay

Cheers ~Mykk

['94 Big Blaze]

desktop dyno no worky for me :confused:

downloads then i can't find it on my computer...

[04silveradomykk]

desktop dyno no worky for me :confused:

downloads then i can't find it on my computer...

my computer/C:/dyno2000

[Bone Crusher]

Thanks buddy I will jump on that tomorrow....I mean today when I wake up

['94 Big Blaze]

my computer/C:/dyno2000
Thanks !! works great !

[04silveradomykk]

I just made another discovery that further facilitates the 4.3L to L31 as a v6 to v8 swap. Both engines use the same distributor base, just the cap changes. They even use the same rotor.

(granted, a LSx doesn't use distributors.)

[Hammer Head]

Does anyone know if the Vortec 4.3L plastic timing chain cover with the crank position sensor will fit a SBC? One would think so.

Depends.. if the SBC is a '96-up Vortec.. yes. If it's anything else.. no.

[04silveradomykk]

A few snags. I decided against those Hi-tech swirl pistons... availabilty was tough, and everytime I found a place with them the cost kept going up... So instead I decided on some Hypereutectic aluminum flat tops with 4 valve reliefs... the engine kit arrived today and they sent me 70cc dished pistons. Yikes, I am not building this motor for 8.5 compression ratio!

I also noticed that the rod with the exploded piston is slightly tweeked. I have extra 5.7" rods in the shop, but now I need to balance the entire rotating assembly... so if I can find a 383 kit priced right I might still go that way.

[bespurcell]

I say 383!

[04silveradomykk]

And I have an idea to get the gear drive to work behind the plastic vortec timing cover without tearing up the plastic.

Cheers ~Mykk

[Bone Crusher]

So this is all for the 350

[04silveradomykk]

So this is all for the 350

Yes, 357ci to be exact... maybe even 385ci

[Bone Crusher]

haha.....I cant even keep up anymore

[04silveradomykk]

I just printed out the wiring ECM schematics for a 2002 G Van 5.7L(0411 PCM) and the PCM harness schematics for my 2004 Silverado 4.3L.

Every single pin is identical between the two computers. The V6 PCM has blank pins where the V8 has the two extra injectors. And where the V8 has EGR pins the V6 is blank... however, even thought the V6 & V8 have injectors in the same pins. They are not the same cylinders, I have a feeling that has to do with firing order.

So we'll see, I'll try my current PCM re-wired and re-tuned.... if it doesn't work I'll snag a 0411 PCM.

[04silveradomykk]

For you guys that did this swap and used your 4.3L wire harness.

Where did you get the V8 fuel injector plug on top of the spider?

[04silveradomykk]

Craigslist is great for an engine builder.

Last night a buddy and and I drove down to Phoenix from Prescott (in the worst rain storm) He bought a non-running 1995 Eagle Talon, lol. and I figured I'd find something for myself while we're going down there.

I found a dude who had an entire ZZ4 rotating assembly for cheap!

http://images.craigslist.org/01040801031201160220080621959758f8d8cbd4180b004528 .jpg

Forged Crank, Rods, Pistons, Dampener, Flex Plate, Timing Chain Cover, Valve Covers, ZZ4 roller cam, roller rockers all for about the price of a generic Pistons, gaskets, oil pump & freeze plugs rebuild kit.... so score!

[rentedmule]

Sweet find! This project has me pumped, I can't wait to see how it turns out

[Mikz86TA]

Are you going to resel some of that stuff like the cam or use it instead of the one you had originally thought of going with?

[04silveradomykk]

Are you going to resel some of that stuff like the cam or use it instead of the one you had originally thought of going with?

Yes, I will re-sell the cam & pistons.

The cam has too high of lift for vortec heads, and it's not computer compatible.

And I need the .040" over pistons I've already got.

[bespurcell]

Nice score.

[04silveradomykk]

I just ran the number on the cam.

# 24502586 - LT4 Hot Cam

Dur @ .050": 218/228

Lift @ 1.5: .492/.492

Lobe Sep : 112

This cam has more lift than what I was looking for with Vortec heads. I really wanted to stay around the .470 mark with a high duration and still be computer compatable.

I was listening to vid clips of the LT4 cam on youtube. The idle sounds kinda weird, it's lumpy but speratic.

[Mikz86TA]

Got any links?

Mine : Edelbrock Perf RPM / .488 .510 Lift@Valve / 234 244 Dur@.050 / 112* LSep.
*Plus I got Comp Magnum 1.6 rollers on top which add to the lift.

http://videos.streetfire.net/video/86-TransAm-355-Flowmaster_140174.htm

[bespurcell]

Nice looking engine Mike.

[04silveradomykk]

Made an EGR block off plate today.

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/EGRplate.jpg

Thinking of having some fun with it and put this logo on the center of the block off

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/evilinside.jpg

The engine with all of the ZZ4 parts.

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/stuff.jpg

I'm debating if the cam in the box is actually a LT4 hot cam... The part number on the rocker arms in the box were for roller rockers but had stamped steel rockers inside.

I can't find any usable numbers on the cam itself. So I'll put a micrometer on the cam lobes and see if the lift matches what a ZZ4 would of come with or if it matches the LT4 specs.

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/cam.jpg

I am leaving for Cali on monday, I'll be gone a week. I won't even get to wrench on my engine, damn it.

Cheers ~Mykk

[04silveradomykk]

When I get back from Cali I'm going to order the rocker arms.

Check these out, I can't resist.

Proform: 1.5 ratio, full roller, narrow body, self aligning.

http://static.summitracing.com/global/images/prod/large/pro-66914c_w.jpg

http://static.summitracing.com/global/images/prod/large/pro-66914_w.jpg

From Summit they are $185.95.... Thats already a great price for those rockers but I bet I can find them cheaper. Hell, even the same rocker set with Summits name on them are $249.95.

So it's getting there.

I already have:

4 bolt main roller cam block, vortec heads, vortec intake manifold & plenum + fuel lines. Vortec timing cover, windage tray, oil pan

.040" over hypereutectic aluminum flat top 4 valve relief pistons.
Full engine gasket set, freeze plugs, oil pump, Main - Rod - Cam bearings.

Forged one piece rear main crank, forged rods, LT4 cam, flywheel & balancer.

I have on order: Polished aluminum valve covers, quiet gear drive for roller cams. v8 injector plug-in.

Will order: roller rockers, roller lifters & pushrods, z28 (or similar) valve springs, updated vortec spider, roller lifter retainers & cage

I still need to do the machine work, head work, gasket matching & bore the plenum to match the CFM-tech 74mm throttlebody.

[Mikz86TA]

Thx Brandon.

Mykk, there wasnt any stampings on the ends of the cam??

[04silveradomykk]

I have more parts on order.

According to these carcraft articles, all I need to do to accommodate the LT4 & 1.6 rocker lift are beehive type springs. No machining necessary to vortec heads. (except to the pushrod holes)

http://www.carcraft.com/projectbuild/116_0403_350_ho_crate_engine_hydraulic_roller_cam_ package_install/index.html

http://www.carcraft.com/techarticles/vortec_valve_spring_upgrade/index.html

So I've ordered the Proform 1.6 ratio, full roller, narrow body, self aligning rocker arms; part # 66915

http://static.summitracing.com/global/images/prod/large/pro-66914_w.jpg

Beehive springs: Comp Cams 26918
matched retainers for springs: Comp Cams 774
and 7 degree locks for the retainers: Comp Cams 648

http://static.summitracing.com/global/images/prod/large/cca-26995-16_w.jpg

I also ordered the gear drive from Summit; quiet, for roller cams. part # G6705

http://static.summitracing.com/global/images/prod/large/sum-g6705-q_w.jpg

And since getting the tall rocker arms nuts with the allen jam nuts to fit under stock stamped tin valve covers is unlikely, I ordered a set of tall, ball milled, polished aluminum covers.

http://static.summitracing.com/global/images/prod/large/trd-6985.jpg

Cheers ~Mykk

[04silveradomykk]

LSx engine to SBC frame.

How to make them.. http://matt.undiagnosed.org/ls1/imag...ount_plate.jpg

Dude, I've been searching this guys site... This looks like what I need to do. He mounted a LS on a SBC frame, and I need to do the opposite but the dimensions should be the same.

he has two variants of the plate. The first one is the one you posted seems to be the most common, an outfit called Welder Series sells that exact plate saying it uses stock SBC frame locations, and has a disclaimer "transmission mount might need to be relocated"

This guy has a 2nd plate:

http://matt.undiagnosed.org/ls1/images/engine/motor_mount.jpg


http://matt.undiagnosed.org/ls1/images/engine/LS1_motor_mount_plate_V2.jpg

...his website is incomplete and doesn't talk about wich plate he ended up using. I dunno man, I was gonna have a freind who owns a fab shop here in town help me make the plates. It looks like he made the second plate due to firewall clearance, and just moved the trans & had a new shaft made.

http://matt.undiagnosed.org/ls1/images/engine/ls1-2.jpg

http://matt.undiagnosed.org/ls1/images/hood_open.jpg

I do see he made an adapter plate to get a t56 trans to bolt in... so I'm lost


I might have to make both designs and see what fits when I get there

BTW: He has the program HPTuners for download in his parent directory.... I dunno if it's a hack with no licensing or not.

http://matt.undiagnosed.org/ls1/HPTuner/

EDIT: After more searching, it looks like hot rod shops that install LSx on SBC frames use a plate similar to the first design...

http://images.streetrodderweb.com/roadtour04/images/0406sr_tour1_13_z.jpg

So I'll go that route.

[Hammer Head]

Yea, that's why I posted up the most common adapter plate. I think you'll be able to figure this all out. You're a pretty smart guy & this sh!t's not rocket science, man.. haha. Good luck & I hope to see this done.