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Old 08-29-2005, 03:29 PM
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Jet sizes for a 750 holley

I put a 750 holley on a stock 390 in my 65 galaxie,it seems to run rich and blows a bit of black carbon out the exhaust so I pulled the front bowl off thinking I blew out the power valve but when I removed the metering block no gas came out and it was dry so thats not the problem. It had 72 jets and I put in 67s and how far down can I go as I have a set of 64s that might go in. I have a feeling that a 750 is probably too big for a stock and high mile 390 but what kind of puzzles me is that it smells rich and will carbon up the motor but the plugs did not look like it was running too rich but I wil give the 67 jets a try but I was wondering who out there is running a holley carb on a 390 and what jets they have in it. Jeff
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