Whats wrong with my 7 bolt block???

[boostingsx98]

I just got a 7 bolt motor for very cheap, it was a close buddies of mine. He did a rebuild on it about 15k ago and everything ran fine. So today i pulled the head of and i noticed piston 2 and 3 move, but not from side to side, you can like twist them and they will twist about a quarter of an inch. The compression on the motor was fine and everything ran great. Is this something i should be worried about, if so what is the problem?

Thanks

 

[KevinRR]

When you push on the piston it should move but it should not twist like that. Why don't you pull the oil pan and take a look at it.

 

[2gawdtsi]

that doesnt sound too great. the Pin holding the piston to the rod shouldnt let the piston twist at all, it doesnt make any sense.

 

[mrTalonAWD95]

somethings up with the top of your rod/wrist pin most likely. take the rods & pistons out and check em out.

 

[boostingsx98]

alright ill check it out this friday when i get off work. It just seems really weird, the motor was running just fine before it was pulled out.

 

[Spdfreak]

that sounds like a wrist pin problem ,you just caught it before it started causing problems.

 

[Jafro]

Very nice that you thought to pull the head on a "known good motor" before installing it. A head gasket is a small price to pay if it saved you the trouble of installing it and then having to pull it right back out... I probably would'a been the cheap bastard that trusted the seller and didn't check just so I wouldn't have to replace the gasket. I can't help but rebuild everything any time I set a head gasket free of it's engine.

Good save! Golf clap!