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Mod | | | Forums66 Topics128,135 Posts1,056,423 Members48,441 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jul 2012 Posts: 17 New Guy | | New Guy Joined: Jul 2012 Posts: 17 | 1969 GMC 7500, manual trany.
Not sure what big V6 I have yet. According to ID tag its a 351M V6. Can I use "C" connecting rods in a "M" engine block? Cant seem to locate replacement M connecting rods. I found a broken rod and piece of a piston skirt in my oil pan. Along with a hole in my oil pan now as well. | | | | | Joined: Feb 2004 Posts: 29,818 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,818 | You're probably also going to find a badly scored crankshaft that might need to be welded and reground. Be careful about swapping cranks- - - -the big V6's were notorious for severe crankshaft balance problems, so salvage the original crank if at all possible. The machine shop where I spent several years working part time sort of specialized in those engines, and they can be a real pain in the butt to keep together.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jul 2012 Posts: 17 New Guy | | New Guy Joined: Jul 2012 Posts: 17 | Ok Thanks. Right trying to locate connecting rods and pistons plus a oil pan too. | | |
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