I have a busted block if you want proof of being carefull. I swapped heads around when I playing around with porting jobs. As a result, I over tighten the right front head bolt and pulled the corner of the block loose, it started seeping water all the time so I replaced it. When I say over tightened, I mean 95 lbs, my '73 Chevrolet manual said 95, but the '73 Pontiac manual said 85 lbs, both used the same engine!
Joe
