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Old 10-09-2020, 01:03 PM   #1
Jeff Stout
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Default 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.
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Old 10-09-2020, 04:15 PM   #2
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Default 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.
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Last edited by GTX JOHN; 10-09-2020 at 07:58 PM.
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Old 10-09-2020, 04:18 PM   #3
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Default Re: Carb size ?

Quote:
Originally Posted by Jeff Stout View Post
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.
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.
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Old 10-09-2020, 04:23 PM   #4
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Default Re: Carb size ?

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Originally Posted by GTX JOHN View Post
Carbs still need to be the original Specs/Dimensions including boosters
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.
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Old 10-09-2020, 04:49 PM   #5
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Default Re: Carb size ?

Thanks for the response. Saves my testing that idea.
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Old 10-09-2020, 07:31 PM   #6
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Default Re: Carb size ?

Quote:
Originally Posted by Billy Nees View Post
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.
Check your PM please
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Old 10-09-2020, 08:03 PM   #7
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Default Re: Carb size ?

Quote:
Originally Posted by Billy Nees View Post
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.
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!
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Old 10-10-2020, 06:32 AM   #8
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Default Re: Carb size ?

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Does fuel inlet position still matter?
Not since they let the Edelbrock Q-Jets in.
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Old 10-10-2020, 11:52 AM   #9
Mark Yacavone
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Default Re: Carb size ?

Quote:
Originally Posted by Billy Nees View Post
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.
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?
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Old 10-10-2020, 03:25 PM   #10
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Default Re: Carb size ?

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Originally Posted by Billy Nees View Post
Not since they let the Edelbrock Q-Jets in.
Thanks .....The price just doubled on all mine =
Better than the Stock Market!
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