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Click on image for the lowdown. 
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7 members (Ponchogl, Otto Skorzeny, moparguy, KEVINSKI, Brian Moore, 55shaker, ShopRag),
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Global Mod,
Mod | | | Forums66 Topics128,030 Posts1,055,424 Members48,422 | | 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!
| | THANKS!
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 2005 Posts: 388 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 388 | Andy, I just measured the ID of the front hole of a 1954 block and it is 1.996 to 2.000". The ID after the step is about 1.85". The Master Parts Manual shows the same size for all 37-57 sixes. Is the remnants of an old plug still in the hole? Hoyt | | |
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