holley vs edelbrock carbs

[dzsv8s10]

i have an s10 with a 350sbc and it has a holley 670cfm carb on it now i think it might be getting to much fuel bc it runs ruch as ****. its got a mild cam in it but nothin extremely radical. i was wonderin wat would be a good size carb and what brand

[Mikz86TA]

650 should be the target carb size. You could actually go a bit smaller.
Is is a Holley squarebore or a spreadbore?

[Tink]

A Holley has more adjustments to it - jets, power valves, shooters - so, typically you start out with the right size cfm and adjust it if needed. Sometimes, they run right out of the box, but can always be optimized.

An Edlebrock seems to be more user friendly, just because there are fewer adjustments.

I'm running Holleys on both my 350s... a 600cfm on a very mild 350 and a 650cfm on a built 350.

[dzsv8s10]

its a spread bore but they dont make a 600cfm carb well the one i have is only made in 570 670 and 770 its a holley street avenger

[em98ss]

i have an s10 with a 350sbc and it has a holley 670cfm carb on it now i think it might be getting to much fuel bc it runs ruch as ****. its got a mild cam in it but nothin extremely radical. i was wonderin wat would be a good size carb and what brand

Can you run one of those in-line fuel pressure regulators? Very true Holley has more ways of adjustments.I've heard pro's and cons about both.I know I always had problems with the power valve, and the needle and seat on Holley carbs.But it could be that I was stupid too. But you could always jet it down if need be, 600-700 is perfect depending on your cam.

It isn't a double pumper is it?

[dzsv8s10]

yeh it is a dubble pumpper thats y im thinkin its gettin to much fuel

[Tink]

Have you done any tuning on this carb at all? You probably need to change the jets... 670 Street Avenger has #65 primary and #68 secondary jets. Does it exhibit any particular running rich issues? Typically, you keep dropping jet sizes until you get a stumble and lean surge... then go back up two jet sizes. There are other things that come into play with Holleys though... pump shot, power valve, shooter... I think there is a tech article on Holley's website about tuning your carb.

There is no 600cfm street avenger - mine is an older carb, non-cathedral float bowls.

[dzsv8s10]

yeh i have alil i kno the jet sizes already

[BigTruckDrivah]

Im with tink, edelbrock carbs are alot easier to mess with.

[em98ss]

I personally don't think the Edelbrock are as good as they used to be, when they was the old Carter AFB's

[hero dave]

I like edelbrock better than holley....less things to mess up if adjusted wrong! darn power valves and crap. I REALLY prefur EFI! even on a built engine.

[Tink]

Those old Carters were good carbs... My friend is running one on his Chevelle.

I love my Holleys though... when they are good, they are awesome. Fiddling with them is a huge PITA though. We have Holleys on all our carbed motors. IMHO, for power, because the Holleys are so adjustable, they are the best carb.

I'd recommend getting a vacuum gauge and a jet kit and start messing with the carb to optimize it. But, if you aren't interested in taking the carb apart to change jets and doing a lot of adjustments... If you want an easy carb, definitely switch to an Edlebrock.

[dzsv8s10]

ne one recmmend a 570 holley dubble pump

[89shortbox]

a smaller carb wont fix your problem. Can you be more specific on what problems your having.

['94 Big Blaze]

got a holley carb on my 3.4 and i would never have another one they suck having to adjust them over and over again.

[neo71665]

For race engines I will go holley all day of the week. On something I drive daily I will run edelbrock or rochester.

Holleys are fine on the street as long as you're willing to tune them every 5 miles or 5 degrees of temp change.

[Tink]

LOL. I love my Holley's on any carbed motor - performance or drivers. Once you get them set-up right, they are great carbs.

['94 Big Blaze]

my holley runs fine once it gets hot...but when its cold out or raining forget it you aint goin nowhere.

[neo71665]

I ran many holleys on the street and never had any luck out of them either.

[Tink]

Mine are a little sluggish cold, but not horrible. Have you ever checked to see if your choke is properly working, Shane?

I've had trouble with Holleys, but I guess I like beating my head against a wall for weeks trying to figure out the problems... :banghead: :D

[spideyjected]

Rochester ftw (o:

[Jongo88]

I have two of them on the boat...

[spideyjected]

They are pretty good IMO.

[Tink]

Quadrajets? The main reason I don't like a quadrajet is due to its leaky fuel bowl... the bowl has pressed-in plugs used to seal holes left after drilling fuel passages during manufacturing. These plugs in the Quadrajet sometimes leak fuel causing hard cold start and bad idle. The Varajet on little blue's 2.8L is the same... it is horrible to start cold. I just don't have the patience for it. With the Holleys, one pump of fuel and they fire right up.

[spideyjected]

Ah, yes. I had a Dual Jet and a Q jet that gave the hard start. I've also had them where they pop off like a throttle body.

[spideyjected]

I guess it's the old keep your GM all GM ad they use to have (o;

I have nothing against the other carbs though.

['94 Big Blaze]

mabe its not working tink, cause if it was all i would have to do is pump the pedel once and then crank it and it should run, correct ?

[Jongo88]

My boat always pops right off...

[Tink]

Yup, every Holley I'm running is like that. The only one I've ever seen a problem with is the one we had on our old 85 C10... it was horrible to start. Found out that the choke wire was dead.

On the quadrajets, I've had ones that fire right up too... the one on the 350 in the K5 before it was pilaged for the Baja, fired right up.

[neo71665]

Quadrajets? The main reason I don't like a quadrajet is due to its leaky fuel bowl... the bowl has pressed-in plugs used to seal holes left after drilling fuel passages during manufacturing. These plugs in the Quadrajet sometimes leak fuel causing hard cold start and bad idle. The Varajet on little blue's 2.8L is the same... it is horrible to start cold. I just don't have the patience for it. With the Holleys, one pump of fuel and they fire right up.


When rebuilding I always epoxy these holes to make sure they don't leak but I guess I'm weird cause I would still take a Rochester over a holley, lol.

The varajet that the 2.8s were given were a bad design from the start,

[spideyjected]

Actually the book on Rochesters I have recommends that you epoxy those plugs. Again, nothing against anything, that's just me.:D