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Mod | | | Forums66 Topics128,024 Posts1,055,395 Members48,422 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Apr 2008 Posts: 643 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 643 | What carb would you recommend? I was going with a 390 but was reading that a 500 might be a better option. Engine is being built with a 3/4cam .60 pistons. For my 58 GMC 1/2ton.
Danny
1958 GMC stepside GMC 302 six cylinder 3 speed OD trans
| | | | | Joined: Feb 2004 Posts: 29,747 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,747 | What RPM are you planning to run?
Cubic inches divided by 2, times RPM, divided by 1728 = Cubic feet per minute.
For instance, a 302 running at 4K RPM has a theoretical CFM of 305. In practice, the real CFM will be 85%-90% of the theoretical number due to intake and exhaust restrictions, failure of the cylinders to empty effectively on the exhaust stroke, etc. In real numbers, your 302 at 4K RPM will be flowing about 314 CFM.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Apr 2008 Posts: 643 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 643 | Just going to be a street engine. Going in my 58 GMC 1/2ton truck
Danny
1958 GMC stepside GMC 302 six cylinder 3 speed OD trans
| | | | | Joined: Apr 2008 Posts: 643 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 643 | Anybody have a GMC302 in their truck that might want to comment.
Danny
1958 GMC stepside GMC 302 six cylinder 3 speed OD trans
| | | | | Joined: Apr 2008 Posts: 643 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 643 |
Danny
1958 GMC stepside GMC 302 six cylinder 3 speed OD trans
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