CLASS RACER FORUM - Differences in Q-jet vs 585 Holley vs 4GC

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Re: Differences in Q-jet vs 585 Holley vs 4GC

Quote:

Originally Posted by Mark Yacavone (Post 490024)

Yes, the 66 540 Holley should be rated about five more than the 4GC, but so far, NHRA doesn't want to hear about it.

Mark, that little carb option is still rated at 274 on our car. 66 nova stickshift. I have heard from a couple racers (not in Midwest) that said the 585 was a legal replacement on the stocker 327 275 but I really really doubt that is legit. We run the QJet on that combo in stock and it works well. ( and UH OH! we actually have the product engineering bypass regulator on our car as well)

Re: Differences in Q-jet vs 585 Holley vs 4GC

With my 65 Impala build, I am able to use a 585 Holley on my 396/325 (410 CI now)I do have one to use, just need to find a manifold. I always feel more comfortable with Holleys too, opinions vs Q-Jet. I will probaly try both anyway.

Will Lamprecht I/SA 65 Impala looking to 2016 season.

Re: Differences in Q-jet vs 585 Holley vs 4GC

Just a thought, maybe better fuel distribution through the manifold with the Holley vs the spread bore Q-Jet even though more CFM with Q-Jet?

Will Lamprecht -

Re: Differences in Q-jet vs 585 Holley vs 4GC

Quote:

Originally Posted by james schaechter (Post 490028)

Yes ,I know all about that deal.
Joe Sr. and I raced a 66 Chevy II way back when you had to use the Holley or Carter , and not the Q jet.
Still possibly the fastest SS/J car in the country at the end of 1973..Record holder, and No. 1 qualifier at the World Finals in Amarillo...with the 540 Holley.
You could use a Q Jet on a 67. This is the reason ,I believe , that Larry Tores built the 67 post car.
Anyway, I think we were talking about SS/GT here.
Don't you think the small Holley should be rated less than the big one, or the Carter, for that matter?
Also nobody has mentioned the little Corvette WCFB yet, on the 520 head combos

Re: Differences in Q-jet vs 585 Holley vs 4GC

Quote:

Originally Posted by james schaechter (Post 490028)

And let me guess; the car is quicker, but only because you're carrying less weight down the track, with that lighter wallet!

Re: Differences in Q-jet vs 585 Holley vs 4GC

Quote:

Originally Posted by nhramnl (Post 500096)

And let me guess; the car is quicker, but only because you're carrying less weight down the track, with that lighter wallet!

I like it on our car with the Qjet. When we were running the 4GC and Holley carb combinations it was never a problem with our old fuel system. We found those two carbs are more forgiving. The Qjet was harder to get consistent performance prior to adding the Product Engineering bypass. Everyone has their own approach to make their car work and opinions are going to vary on where to spend their money.

http://i303.photobucket.com/albums/n...ps7a6c0c73.jpg

Re: Differences in Q-jet vs 585 Holley vs 4GC

Holleys are easier to change the boosters on. Just a thought.