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GMC block vs Chevy block
I pulled my woren out 350 out of my 76 gmc pickup and am trying to put my 400 in it but the motor mounts are about 1 inch back and the tranny is bolted to it so its back all the way i was wondering if there was any diffrences in the blocks or if any one has an idea of whats going on.
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Shouldn't be unless someone has stuck a Buick, Olds, or Pontiac motor in there. Is the tranny's bell housing bolt pattern a BOP pattern or is it a Chevy pattern? There are also adapters that will mate a Chevy motor to a BOP tranny as well.
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Does the tranny have the short tail shaft instead of the long one??
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The engine blocks should be the same,the difference is probably in your trans mount. If you are using the original trans,and just a new engine, I don't know why it's an inch off,but no big deal,just move the frame brackets. Hank
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Your post is a bi cryptic.
The transmission mounts are different for a th350 and th400 transmissions.
If you have not changed the transmission or trans mounts- I suspect that you have the engine mount brackets on incorrectly.