OK, Cam I have is a Crane 272h engerizer - @ .50 is 216/216. I am going with 1.5 rockers. Says spring requirements are Closed 105lbs @ 1.700 and 265lbs @ 1.28.

The GM Performance springs are 120# @ 1.700 and 300# @ 1.25.

The numbers arn't exact but does this fall in an acceptable range for this cam? I wish they would post a range instead of a exact #.

You are going to love that cam!

I'm running the same cam in my 327 with Trick Flow heads. If you go to the Trick Flow website you will see what springs they use. Haven't had any problems yet.

Mike