Proper carb for 390
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Junior Member
Joined: Nov 2018
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Proper carb for 390
Hi guys Im just trying to figure out why my 1976 390 is not running like it should someone told me that I have too big of a carb on it it has an Edelbrock 8867 what do you all think?
Senior Member
Joined: Apr 2018
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5 Year Member
Joined: Jul 2018
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From: Paso Robles, Ca.
A 390with stock truck heads is not the most free flowing I had a 351 W stroked to 396 with edelbrock heads it was dyno tuned with a Holley hp 600 cfm . Unfortunately the only way to be sure is Dyno tuning or some sort of air fuel setup
5 Year Member
Joined: May 2014
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From: Chico, Ca.
The 8867 comes up as 600 cfm, so it's adequate for a typical 390. It's a copy of the Carter AFB/AVS (depending on whether it has mechanical or vacuum operated secondaries) and is a decent carb. In proper order they run fine, but it's a considerable undertaking to perform any significant tuning adjustments on them, with the exception of idle speed and mixture. Holley's are a walk in the park to dial in, I love 'em.
