L31 or L31R Crate engine?

[reloder28]

I have a 98 Tahoe. It has cracked both heads within 30,000 miles of the first mishap. Decided to buy a crate motor & have narrowed it down to GM #12530282 or 12530283. I can't tell the difference except the 283 is a four bolt main.

Is there a meaningful difference?
Will the new motor have the same head cracking problem?







Posted on www.tahoeyukonforum.com also

 

[reloder28]

Thanks for the input. Really helped me make my decision.

 

[tahoe nick]

Aha. My experience exACTLY