Its been a while since I've been on here. Too bumed out to look at my car again.
In any case. I rebuilt my motor a year ago (440). Did the standard rebuild to it... bearings, bore .030, rings, cam, etc. It never ran quite right, as on the first start up I wiped a lobe on my cam. After putting another cam in, it still never acted quite right. Always really low on power and making very odd ticking noices that I never could locate.
Then after reving it up one day in the driveway trying to hear the ticking, it killed and never started again. I checked all the usual things and nothing seemed to be wrong. But then I checked the compression, 165-170 psi on 2 cylinders, 50-60 on two others, and 0 on two more. The other two cyliders were to hard to check with my tool.
I did a compression check when first putting the motor together and all were 165-170 psi.
What could cause this compression drop?
The only thing I can think of is valve train problems. Hence why I am asking what the max lift is on a set of 906 heads. And by lift I mean the max lift before a valve stem hits the head or something. I have a Hughes cam with about .548 lift.
