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Mod | | | Forums66 Topics128,065 Posts1,055,868 Members48,428 | | 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: Dec 2013 Posts: 45 'Bolter | | 'Bolter Joined: Dec 2013 Posts: 45 | I just bought two engines that I also need help to id. first is casting #3837004 with A16 6 behind the starter and the second is #3836233 but the starter is still on it so can't read the numbers. What is the max bore for these engines? One is already .060 over. Thank you in advance, Gerry Lee | | | | | Joined: Dec 2013 Posts: 45 'Bolter | | 'Bolter Joined: Dec 2013 Posts: 45 | Just pulled the starter and the numbers are E6 55. Thanks again, Gerry | | | | | Joined: Mar 2010 Posts: 1,660 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,660 |
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
| | | | | Joined: Dec 2018 Posts: 2,450 'Bolter | | 'Bolter Joined: Dec 2018 Posts: 2,450 | 51 3804 They now offer 0.080 over for the 261 it ends up 272 cu. in. | | | | | Joined: Mar 2010 Posts: 1,660 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,660 | Fixite7, which of the 2 casting numbers would you choose to install 80 over 261 pistons?
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
| | | | | Joined: Dec 2013 Posts: 45 'Bolter | | 'Bolter Joined: Dec 2013 Posts: 45 | Thank you for your help. Was able to date both engines. Thanks again Gerry | | | | | Joined: Dec 2018 Posts: 2,450 'Bolter | | 'Bolter Joined: Dec 2018 Posts: 2,450 | buoymaker I don't know,I suppose the newest one,when I bored mine seemed able to handle it. Gotta watch for sand holes in the casting. | | |
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