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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 |
3B,
Do those two letters (if present) give information about a GMC engine that came from the factory with some combination of non-standard cylinder bore and/or non-standard crankshaft journal size(s) (rod and/or main)?
Tim
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