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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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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!
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| | | | Joined: Jun 2005 Posts: 388 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 388 | Dave,
This is great.
Might want to add when when the shift from 15-bolt to 18-bolt heads was made. It is my understanding that all of the 1953 (even the 1953 stick with the splash and iron pistons) and later 235s have the 18-bolt heads and all earlier 235s and all 216s have 15-bolt heads. Another big change was the increase in cam bearing diameters in some of the 1953-54 and all 55 and later engines. I believe that the Corvette six and 261s were the first engines to have the larger diameter bearings.
Another confusing change (that I do not recall) is the oil pan and oil pump changes.
Hoyt | | |
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