I am with GT guy here... What do you plan on doing with the car??The larger carbs, while certainly tunable for a specific application, will still sacrifice some lower rpm throttle response due to the lower air velocities through the larger venturis.
Engineering-wise, a 331 would need to be spinning north of 7500 rpm before 750 cfm would be consumed. And even that's with a volumetric efficiency that is probably not going to be seen on a street engine. Theoretically, of course.
That's my 2 cents worth (and that's probably over-paying for it too).
Many moon’s agoHave you any experience with carb tuning?
90% street, 10% bracket racingI am with GT guy here... What do you plan on doing with the car??
I’m a dumbass, I tried to change it but don’t know how to edit the title You may wanna edit the title of your thread.Change it from conversation to conversion.
Sounds like you’ve got yours dialed in. I’m not making any decision on mine yet, I’m taking another route. My problem is that my engine quits making power at about 4,000 rpm. I’ve replaced the entire electrical system with MSD, Holly and Terminator X with no improvement. If it’s not electrical, ignition wise, I figure it may be mechanical, as in the valve train. When I built the engine we used GT40 3 bar heads. Everyone thought that those heads just weren’t enough to make the power I wanted, they’d hold me back. I wish I had listened.If I had efi, I would keep it and tune with it. I plan a Holley efi system on my 82 as soon as I can get there.
That said, my 331 with AFR 185s, dynoed at 415hp and 415 tq, on an engine dyno, using a 600 cfm Holley 80457 vacuum secondary carb. AF ratio was good all through the rev range to 6200. Dyno shop said it did not need a bigger carb or other stuff.
I’ve made the decision to replace my GT40 heads with Liberty aluminum 185 heads,
If you set up an account you are able to contact them.From where?
I just looked at what I "think" is their website and it looks shady as eff.
Is this it? https://www.libertyperformance.com/
No address
No contact number
Only way to contact is by email?
Nope
Have you done business with them before?
If you set up an account you are able to contact them.
My builder has used their heads with good luck. The only thing he doesn’t like are their rockers, but I was planning to use Scorpion.
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