Mike, what engines came with the 13" clutch? I don't know but suspect it won't fit on the normal 235 and 261 flywheel or in the bell housing? Wouldn't be surprised if there were a larger heavy duty flywheel and bellhousing, I just haven't heard of it for the Chevy 6 cyl.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-