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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,079 Posts1,056,300 Members48,441 | | 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: Mar 2010 Posts: 1,660 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,660 | I'm just trying to follow the logic.
'38-'52~ 216 US GM side of head is open to the lifter galley and has a tall galley cover,
'50-'53 235 US GM (previously military only) has the short cover.
'50?-'52 216 Canada GM also has the short cover.
Manufacturing head and block forms for a foundry are $$$ or CA$$$.
Could the early '50-'53 un-tooled blocks be bored out to 216 and 235?
"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."
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