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360Rocket's 1970 GTO

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Hello. My name is Brett and Im new to the club. I am putting back together a motor and having issues lining up water pump and crankshaft pulley....off by about 1/4". The old pulley blew off into the bushes never to be found so I could match up. 

Any insight?  Thanks inadvance


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Welcome to FP.

I'd reach out to Frank's Pontiac Parts and see what they have on hand. I'd be surprised if they didn't have pulleys for a 389 or 421.


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Not using a Chevy water pump pulley are you? That will give you the difference you mention. If you had the A/C pulley and spacer on the crank, and didn't put it back on, that will give 1/4" the other way.

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