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Originally Posted by 392cobra
You said you have 72's front and rear.
Do you have a power valve on the rear ?
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I honestly don't know. I would think it would be whatever comes with a Holley 4150 750cfm. I'm not too sure if JET Performance changes anything there or not.
I do have 72's on front and rear. It ran a bit lean before the upgrades, and it seems to now fall flat on it's face at about 3500 rpm. I made one run down the street and came back. It seems it was pretty obvious the jetting was low (at least I'm hoping it's that easy).
