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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...

Comedy of errors chain of events: Jan 2013 - CSPI went out, new MFPI installed $800 Jan 2013 - Cracked head dumping coolant into the exhaust - $2200 Dec 2013 - Threw code, major tuneup - $500 Threw another code en route home from repair shop. Returned to shop and the code read "right bank rich"...