ProComp/Speedmaster aluminum heads

Yep, been running them since June. Bought them bare. I just lapped some summit valves and used trickflow springs, 1.460 o.d. because my comp 1.5 o.d. springs wouldn't fit. Heck, I never even checked the spring height. Car went 7.07 last night in the 1/8th. I still have cheap summit brand headers.