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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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8 members (Stovebolt48, Charles in CA, farmallb, Chip O, TooMany2count, 3800GUY, Wayne67vert, Otto Skorzeny),
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Global Mod,
Mod | | | Forums66 Topics128,006 Posts1,055,272 Members48,418 | | 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: Nov 2000 Posts: 45 Member | | Member Joined: Nov 2000 Posts: 45 | In 1956 Chevy increased the compression ratio from 7.5 to 8 to 1 and then to 8.25 to 1 in 1958 on the 235. They did this by making the combustion chamber smaller. The "848" heads were used from 1956-62. In order to maximize the performance potential of the 235, the "848" head is recommended because of these smaller chambers. Not sure if there is any real difference between the 56-57 heads and the 58-62 ones, It may just be a "marketing ploy". | | |
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