Okay say a car has had a head and cam put in and the pushrods where too long...they where suppose to be 7.25, but 7.4 was used...could this cause geometry to be off and the lifter roller break off and put a hole in my block...is this reasonable?

 

Theoretically possible I suppose but not particularly likely. For one thing 7.250" is a pretty uncommon pushrod length. Additionally, the valve side of the valvetrain is presumably more vulnerable to the adverse effects of an excessively long pushrod - i.e. bent valves with piston damage rather than the cam/lifter side.

 

I would say a bent/broken valve, bent pushrod and a hole in the piston would happen first.

 

What rockers?


Stock rockers would likely hold the valves open with pushrods that were 0.150" too long, not sure how the motor even ran.

 

The only time I ever saw a roller blow off a rocker was when there was a major oiling problem....ask me how I know

 

See thats what i thought, a guy put on heads and cam on this guys car, and he cryin cause he has a hole in his block, but i think its cause he pulled off his heads and didnt blow out his bolt holes and torqued down his heads and pop...but i was just wondering if it was possible

 

Time for a forensic tear down.

 

Very unlikely. As others have mentioned, the valves would have hung open and bent/broke as they are much weaker links in the chain than the lifter.

Hole in the block is usually either a connecting rod snapped, or non-compressible fluid left in the head bolt holes during tightening.

With that said, the head bolt problem usually just cracks the block and doesn't open up a hole.

 

I agree with this exactly.....either way it needs tore down, then you will know for sure