Power Valve Selection: The Definitive Answer

A More recent article: Carb Science Series: Holley Power Valves — Explanation And Tuning And Just a little addendum to this topic. I recently swapped to Trick Flows, about .5 bump up in compression, an AG to a single plane, and a much bigger cam (from a [email protected]” 106 LSA 68 degrees overlap hyd to a [email protected]” 106 LSA 84 degrees overlap solid) using the same 750 DP and to date have only fiddled with both idle speed and four corner idle mixture screws. My cruise vacuum has dropped from the original 17-20 with the previous combo to 15-17 with this current combo. And idle vacuum has plummeted to around 5 or so in gear (from approx 11 previously) But that 10.5 PV I have been running, that had really given a good kick in the rear previously still kicks in for an even bigger kick in the *** when riding on the primaries. Power Valve selection based on cruise vacuum:thumbsup: