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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Mar 2003 Posts: 181 Shop Shark | | Shop Shark Joined: Mar 2003 Posts: 181 | I have a 66 GMC 1/2 ton 4x4 with a 305 V6 in it. It was siezed when I bought it but I have since freed it up. I am in the process of rebuilding the motor but can't find anything on what the crankshaft diameter should be on the connecting rods and at the main bearings. Anyone know where I can get this info? I have tune up specs but not rebuild specs. Thanks! :confused: | | | | | Joined: Mar 2003 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2003 Posts: 45 | The main diameter is: 3.1237"-3.1247" on#1,2,3 and 3.1239"-3.1229" on #4 and the rods are:2.8112"-2.8122" get back to me if you need other specs. | | | | | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 |
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
| | | | | Joined: Mar 2003 Posts: 181 Shop Shark | | Shop Shark Joined: Mar 2003 Posts: 181 | Thanks for the info. I measured the crank and the pistons to find that my motor (with 125,000miles) has never been turned or bored  . Thanks again for the info! | | | | | Joined: Jul 2001 Posts: 140 Shop Shark | | Shop Shark Joined: Jul 2001 Posts: 140 | GMC V6: Built to last. They could go about 300,000 miles before a major overhaul.  You just don't see that any more. Iron has gone the way of the dodo. Its all about the aluminum and composit plastics now. 
Jonathan S. Keffer
Certified Yeti Trainer
Richard Roy Schlicht-
Good Grandfather, Veteran Wrench Turner...
"If it ain't broke, fix it 'till it is..."
Es gibt nichts, zu befürchten, aber befürchtet sich.
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