Selling the new cam and springs

[kevsxtreme02]

Guys,

I was planning on a head/cam swap for the s10 but ran out of money. So here it is on ebay: a Comp 260 AHR and Comp 983-12 Springs : http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1,1&item=8020805585&sspagename=STRK%3AMESE%3AIT

Thanks for looking.. letting it go for dirt cheap..starting it at 50 bucks.. just trying to get some money for school. Thanks again,

Kevin

[Maximus]

That's a pretty big loss for that cam.Did you buy it new?

[Finkle]

i've just started looking for a new cam to put on my 4.3L?
can anyone tell me what to expect from this cam? as in gains, how big of a diff there is and, would i need to get different lifters???

any help/input is awesome,
thx in advance,
Gary

[Sparky2263]

http://www.compcams.com/Technical/Search/CamDetails.asp?PartNumber=09-412-8

There's the specs for it. That's the biggest you can go without major head mods. It'll wake up a stock 4.3 in a LARGE way.

For your 5 spd 3.73 and Wynjammer I'd say you'd pick up 30-50 hp depending on how well it's complimented program-wise.

For the price, it'd be hard to pass up regardless.

[rat]

There's the specs for it. That's the biggest you can go without major head mods.
You do need to deal with the valve guide clearence issues with that cam in the '96 up trucks. It has .5" of lift with 1.5 rockers. Stock clearence is around .480" or so. There are a couple of options, +.050" valve locks, or cutting the guides. The 983-12 springs bareley fit over the stock spring seats. The od of the seat is .850", and the Id on the spring is about .845.


It is a great cam though, it is the one I have in my truck. I kind of wish i had gone just a little bigger, like the 266hr. But it drives like stock, except has a better midrange and top end. I feel that i lost little to no low end torque. It also improved my fuel economy slightly. GM should have put that cam in stock, oh, wait, they did in the '92-'95 Cpi motors, or one like it anyways.

Additional things needed for that cam at a minimum are:
Locks
Retainers
Deal with Guide clearence

Other "optional" things would be(some should be replaced especialy if you have some miles):
Timing chain
Lifters
Adjustable rockers
EDIT: Some part numbers for these parts can be seen here 3rd from the bottom: http://www.compcams.com/Technical/CurrentCatalog/HTML/124-127.asp
I needed a tune, weather it is just a problem with my truck, or the cam took it too far out of the stock parameters i don't know.

[Finkle]

so if i were to go with this cam and spring set, how would i deal with the guide clearance??

[rat]

Option #1: 614-12 +.050" valve locks. This moves the retainer up .050" higher, giveing more clearence. Problems are that the retainer to rocker clearence could be an issue. Also, installed height must be checked, i am willing to bet about .050" of shims would be needed with this option. I don't kwow anyone who has gone this route, but if it works you wouldn't have to pull the heads. EDIT: also you might have problems if you use aftermarket self alighning rockers. The "nubs" might not clear the retainer. Your 2000 stock rockers would not have this problem, it would be out at the outside of the rocker that would have problems with the stock stuff.

Option #2: This is what i did. I cut the guides lower, for more retainer to seal clearence. I bought the tools from comp to do it myself. While i was at it i cut the od of the guide down by the spring seat a little smaller. Tools to do both are about $120. It works with a regular hand drill with a .5" chuck, and uses the guide to line up the tool. You need to know how to use a set of dial calipers for this option. You can also pay it done for the about same or less than the cost of the tools. I know this option works, but you do have to pull the heads, and maybe have them sent to a shop to be worked on.

[Finkle]

so basically i have to get some sort of work done,
is there an option with a diff cam, that i have to do absolutely nuthin

[rat]

so basically i have to get some sort of work done,
is there an option with a diff cam, that i have to do absolutely nuthin
http://www.cranecams.com/?show=browseParts&lvl=2&prt=5&Vehicle_Type=Auto&Cylinders=6&Engine_Make=CHEVROLET&Year=2000&Engine_Size=4.3%20L&partNumber=1439811&partType=camshaft
That one should be great with your boosted aplication. It has a ton of exhaust duration. The intake duration is a little on the low side, but it will have a nice idle, and rev free'er up to redline. You can also run 1.6 rockers with that cam, no clearence issues.

Another thing to look into is having comp regrind it. Last i knew comp will regrind for free, but call to be sure. I knew a guy that bought a comp cam second hand, they told him they would regrind it, but when it was down there they decided not to. I don't know if he was the best to be talking to them about cam specs though, he didn't really get why it had to be reground in the first place.

You would have comp regrind it for no more than .470" of lift.

[subvelocity]

As far as that Crane 260/276 cam, it will definitely leave you wanting more. Rat, you said you wish you went one step up on your cam, and I feel the exact same way. I have that Crane cam, and the 1.6 rockers. There is for sure a difference above stock, but for the effort I put into swapping cams, I wish I would have gone to the #1439721, which is one step up. You get into the .480 and above lifts then, but I really think it would be worth it.

[Finkle]

i guess the guide clearance work doesnt really bother me, ive got 110,000km on the motor so ill just wait till the motor starts to go b4 i put it all in, i do drive my truck pretty hard so im figuring maybe ill get 200k out of her but i doubt especially with the blower....lol...then i would do a full out rebuild with major mods
Start getting some parts now so its not as big of a hit on the old wallet