Anybody use EngineQuest cylinder heads?

Hmm. That 1110 spring should be sufficient for that cam. I'm guessing you were having valvetrain issues of some kind. The Eddy heads take a stud rocker. What rockers were you running on the EQ heads?

I had the 1110 springs on my Iron Ram heads with the 1.90 valves. Car went 11.70 at darn near 3400 lbs with a stock magnum shortblock. I have significant doubts that my car would have run bottom 11s by switching to the Edelbrock heads.

Granted, I was running the CH318B heads, with the LA style RPM Air Gap intake.