I'm getting a surge, almost a miss, between 3200 and 3800 rpm.
The motor is a 508 BBF, 12:1, .715" lift mechanical roller, timing set at 34 total. Rings, bearings, timing set, valve job, lifers and rockers this season, but the bottom end is basically the same combo as last year. What's new is the Trick Flow intake, 1150 Dominator and scoop. 86 (92's from factory) and 102 jets with a 5.5 power valve (factory). I'm thinking the power valve should be a 3.5 (as in the 925cfm carb I replaced) or maybe a 2.5. There aren't any vacuum ports on this carb or manifold. Hoping the experts can help me out here, not sure the PV would even cause this problem. Thanks