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Click on image for the lowdown. 
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| | | Forums66 Topics128,130 Posts1,056,717 Members48,454 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jun 2021 Posts: 105 'Bolter | | 'Bolter Joined: Jun 2021 Posts: 105 | My truck had a 235 in it when I bought it in 1976. I found and installed the 270 around 1979. I could not find a flywheel then, so I had the 6 bolt pattern machined into the 4 bolt 235's flywheel. My flywheel is still installed, so I am not 100% confident of my measurement of the bolt circle diameter, but I believe it to be 4-1/16". It is a 168 tooth ring gear.
1950 GMC 100 Panel Truck, 1958 270, 3-spd Saginaw with BW OD, 3.73 12 Bolt Differential from a 1966 C10, Front Disc Brakes Hill Holder Bought it in pieces 9-1976, driving since 6-1978 Follow in the DITY | | |
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