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1970 Chevy Nova Carburator information

Tiny
MARKEYDSL
  • MEMBER
  • 1970 CHEVROLET NOVA
  • V8
  • 2WD
  • MANUAL
  • 98,652 MILES
Hello;
I have a 1970 Nova with a 307 small block. We are having it rebuilt and are selecting a new 4 barrel carb for it. I am wondering how Many CFM would be appropriate for this engine, i.E 400, 500, 600, or what would be to much.

Thank you
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Thursday, January 8th, 2009 AT 10:24 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
If stock, the I would go 400-450cfm. If you are using high-flow aluminum heads, performance cam, performance intake then you will need more.

Holley, edlebrock etc, have CFM calculators on their websites, carb selection would be based not only on displacement, but head selection, camshaft profile, intake manifold.
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Friday, January 9th, 2009 AT 9:44 AM

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