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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: Dec 2013 Posts: 17 'Bolter | | 'Bolter Joined: Dec 2013 Posts: 17 | I've not yet had the front cover (timing gear cover) off of my 302 GMC. My timing is 120 degrees out of phase if I wish to use the flywheel timing marks--obviously assembled incorrectly. [#1 firing position, crank and cam, has the flywheel 120 degrees in advance of the TDC circle.] I can surely time the engine, just not using the flywheel markings made by GM. Does the crank have more than one keyway for the timing gear? I thought, but can't find a pic, showing 3 keyways.
phone: 636-219-7705
| | | | | Joined: Jul 2013 Posts: 200 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 200 | Yes, some performance timing sets have multiple keyways, but they only allow a +/- 4° movement of the camshaft, and this isn't whats causing your issue. You either have mismatched parts like a bellhousing from an engine other than a GMC engine, or its just simply assembled incorrectly. I'm sure once you disassemble things, the problem will likely reveal itself clearly.
We cannot solve our problems today using the same thinking we used when we created them!
Albert Einstein
| | | | | Joined: Feb 2004 Posts: 29,792 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,792 | Check this link:
http://www.ebay.com/itm/1960-1962-Chevrolet-C10-truck-manual-transmission-235-engine-flywheel-ring-gear-/291579586582?fits=Make%3AChevrolet&hash=item43e37f6816:g:p2cAAOSw37tWBEHs&vxp=mtr
Every 235/261 flywheel I've looked at on ebay has three dowel pin holes- - - -chances are somebody has installed the flywheel in the wrong position.
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 2013 Posts: 200 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 200 | Yes, with (3) as possible choices, that's 120° rotation with each choice.
We cannot solve our problems today using the same thinking we used when we created them!
Albert Einstein
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