After my 2016 EMC build 469 ci SPEC build using RPM heads I have determined some eye opening results. The SPEC rules that year mandated the use of Edelbrocks RPM heads and no welding or epoxy whatsoever was allowed so this limited us to a stock offset rocker. We were also required to use the stem size and head diameter of the valves that Edelbrock states. This meant 2.14/1.81" and that was it. The cylinder heads were ported hastily and a peak of 298-299 cfm was my first and last result--meaning I didn't agonize at all--they were what they were and that is all. I made a best of 592 ft/lbs @ 3500 rpm ZERO dip and 653 ft/lbs @ 4800 rpm with 680 hp @ 6100-6300 rpm IIRC. This build really makes me question the Victors when used with a standard port opening, I mean if you are required to use a big .650" offset rocker then why the heck would you NOT open the port to gain more CSA?

What this means to me is--On your engine Brad, the Victors are a waste. You could have gotten where you are with regular old RPM,s. I've said it before and I'll say it again--I don't know why Edelbrock would even offer them in a standard port. IMO selecting standard port Victors and not targeting BIG power--800-900HP is a dichotomy. Victors should be used only by masochists and those that are hoping for well into the 800+hp range. J.Rob