Quote:
Originally Posted by Squidward
I am not a tuning guru by any stretch. I think you could get into the 13's with your setup, tho.
Still hoping you can find the performance you are looking for. Just got back from a drive in my bird, and the 350 runs hard. Keep at it!
I had the same question about your carb tuning. You are cammed up, and I can't imagine your idle vacuum is any better than 12-15" max. Hoping your power valve is matched. And your vacuum secondary out of the box settings likely don't match your engine. It has been years since I played with a Holley, so I will step aside on that adventure. Your timing sounds adequate.
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I've asked questions about the carb tune before on this one. A 650 should support that engine to about 5400 or so. Shoot for about 67-69 jets primary, .055 PVCR depending on primary HSAB. Secondary should be adequate, it would be good to know what secondary plate is in this 4160.
Please let us know what vacuum secondary spring is currently installed? What is the list number from the airhorn?
Rhodes lifters could be a good option to tame the cam. The issue with those pumping numbers, you may have trouble managing pump fuel if you go with a smaller cam and standard lifters. Advancing the cam makes the intake closing point happen earlier so it builds cylinder pressure and moves RPM range down. If that's not enough to recover torque 2000-3500, you'll need the rhodes.