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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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| | | | Joined: Mar 2014 Posts: 4,520 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,520 | As Jerry reiterated, they're for alignment. As long as you haven't done something nutty like drill new holes in your flywheel, the pattern will prevent you from installing the flywheel in the 235 incorrectly. The holes are indeed drilled all the way through the flange and the dowel pins are an interference fit. The length of each pin is 1 1/8" with 3/8" diameter. Good luck.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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