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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | The "848" cylinder head is a high compression head that was used between 1956 and 1963. It is most likely the most commonly available head for the 18-bolt-head 235 engines produced from 1953-1963.
Between 1955 and 1956, the compression of the 235 engine increased from 7.5 to 8.0; and, the compression increased to 8.25 in 1958.
The compression-difference in the 1956 848 head supposedly has to do with a smaller "combustion chamber". Pre '68 Dave will mostly explain this, and explain the 1958 and later increase in compression. The Shop Manual describes a 1958 change in valve to head angles, and the use of heavy-truck-like valve rotators, and heavier valve springs.
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