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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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#84305 10/15/2007 2:48 AM | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | The bellhousing patterns are very different. You can use any 235/261 full pressure, or the 228/248/270/302 (best choice) as a virual bolt in using the existing bellhousing. The Chevy front mounts are different due to the length difference in the engines (GMC is longer).
A later 6 can be made to fit, but will require fabbing up side mounts for the block, and the bellhousing will have to be swapped out for a Chevy V8 bellhousing from '55-'66 with the crossmember mounts.
Bill Burmeister
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