Carb size ?
 

A max size carb per rules for each motor combo. I know we no longer need carb numbers to be correct per engine. Any rule on how small a Qjet you can have? Asking to try a small cfm if legal.

Re: Carb size ?
 

Carbs still need to be the original Specs/Dimensions including boosters/Throttle blades. have

I prefer the Edelbrock Replacement Q Jets.
I have several in great shape and even NOS.!

I believe a 750 must replace a 750
and 800 replace a 800.

You can easily look down the throat to see the difference.

Believe it or not = I used to race a National Recording Holding 86 Ram 100 with
a Q jet.

Re: Carb size ?
 

If you are still running the 307 roller combo, you must use an 800 CFM Q-Jet. Plus .005 or minus .015. Same carb that I have to use on my 301 Pontiac.
Just a bit of advice, don't listen to what some "previously employed by NHRA" people might have told you.

Re: Carb size ?
 

Yeah, I wish that this were true John but look at all of the replacement Holleys that have "down-leg" boosters. The only thing that matters anymore is throttle bore and venturi size.

Re: Carb size ?
 

Thanks for the response. Saves my testing that idea.

Re: Carb size ?
 

Check your PM please

Re: Carb size ?
 

Really?

Glad I still have a lathe and my moto tools

Does fuel inlet position still matter?

I think we are going to find a tenth!

Re: Carb size ?
 

Not since they let the Edelbrock Q-Jets in.

Re: Carb size ?
 

I did not know that. I know several guys who used a 207 carb in place of an 800 late model
I assumed the rule was kinda like .030 over, vs. .080 over.

How's that "no tech" working out, again?

Re: Carb size ?
 

Thanks .....The price just doubled on all mine =
Better than the Stock Market!