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I bought a 327 in a corvair (thats another story) that was complete but needed some freshening up (sat 10 years) with a few mild mods. I did the once over, but decided to replace the carb rather than rebuild (lots of varnish/grime) with a new version of what was on it: a 750CFM edelbrock performer. Well the engine is in my 63 nova now, and with the same metering rods and jets as were in the carb that was on the engine when I bought it, I'm running real rich. It smells like gas BAD when I'm at idle, heck all the time really.

I looked at the edelbrock manual and the jet/rod combo has me pretty low in the bottom left quarter (on the lean side).

Whats a guy to do? Do I offer this 750CFM carb on criagslist and buy the more appropriate 600CFM carb and chalk the $200 up to "I should have none better" or do you guys have any other ideas?

As always, thanks for the help
 

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Check the vacuum at idle and read the manual about the metering rod springs. Whats going on is with a camshaft with alot of over lap you have little vacuum at idle and it will not hold down the metering rods so your jet size is what is needed when all 4 barrels are open. there is a kit you buy that has all the jets, springs and metering rods plus a book that shows you how to adjust the carb. I've run several 750's on 327's. Remember at idle the engine does not know what size the carb is only at wide open throttle can you tell what cfm the carb is.


I bought a 327 in a corvair (thats another story) that was complete but needed some freshening up (sat 10 years) with a few mild mods. I did the once over, but decided to replace the carb rather than rebuild (lots of varnish/grime) with a new version of what was on it: a 750CFM edelbrock performer. Well the engine is in my 63 nova now, and with the same metering rods and jets as were in the carb that was on the engine when I bought it, I'm running real rich. It smells like gas BAD when I'm at idle, heck all the time really.

I looked at the edelbrock manual and the jet/rod combo has me pretty low in the bottom left quarter (on the lean side).

Whats a guy to do? Do I offer this 750CFM carb on criagslist and buy the more appropriate 600CFM carb and chalk the $200 up to "I should have none better" or do you guys have any other ideas?

As always, thanks for the help
 

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running a 750 on a 327 right now, just dropped the jets down like .006 from the box, runs great, 480 lift cam, stock heads and 10.5 to one.. love it..oh and had to drop the accl. pump way low..:) hope that helps..
 
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