Torque To Yield Head bolts. Can they be reused or not on a 3.1/3.4 L GM?

Standing behind the warranty? Why didn't they put a warranty on that cheap pice of plastic intake gasket on the 3.1 I've been working on and spend $$$$$$ on . That turned me against GM products when i found that platic gasket caused oil to get in the water , cheap peice of junk gasket on a 16,000 dollar car???? Canada has a class action law suite on GM for not recalling th cars with plastic gaskets.

 

Many aircraft connecting rod bolts are tightened by measuring stretch. When the bolt is removed, the Feds and the engine manufacturers require the bolt be replaced. The FAA is very fussy about rod bolts ever since a bunch of counterfeit Lycoming rod bolts got into circulation in the USA. And this time don't blame the Chinese - these bad bolts came from Germany.

 

I have a friend that works at Ford motor engine. They do re-use the tty bolts after an engine teardown but do not put the head bolts back in the original bolt holes.

 

6 yr old thread guys.

I do wonder how the bolts held up though.

 

The problem is with how we educate engineers here vs. In other countries. In a university accredited engineering program, engineering students get NO hands on training but have to take all the BS classes (no offense meaant), which keep increasing and taking away from vital engineering classes or adding to the time it takes to complete the program. It should be more of a hybrid trade school, maybe in conjunction with a university for some classes (physics, chemistry, etc.) for those gifted with mathematical aptitude (most machinists also have to have good mathematical aptitude) but where they get hands on experience. The best engineers I know have lots of hands on experience and the best one that I know is a guy I went to school with is probably also one of the most skilled machinists out there having done that since HS, is a good mechanic, and also a damn good welder.

I hate when that happens.