[norustscott]

Basic assembly follow-up? do you mean checking your work? Sure...once done correctly though, what changes, 1 hour... 12 hours...3 years after you originally torqued the heads... and have not run the engine? Test stand...would be nice and if you have one then by all means re-torque the heads...


80 psi is bad...My thought on causes:

valve adjustment/ clearence (go ahead and open it up to .008 - .010" for the test)
broken ring...from installation
bad lifter...search past posts on my famous growing lifter...
Ring end gap stager/alignment...hmmm. may loose compression but 60spi is unlikely any body havea data point on this?
poor valve to seat seal...did you lap the valves?
Poor cylinder to head seal...did you lap the pistons to the cylinders?
Some kind of wierd bent valve hang in the guide
Rocker arm binding on the shaft
Pushrod stepping out of the rocker cup



If it is not a valve clearence/adjust problem then you are unfortunatly going to have to drop and inspect...I have been there...I feel you pain...