Still working on the 53 Truck rebuild. Working on the engine now. I wanted to replace the wrist pins on the 1957 235 engine in this truck (not the original 216). I have seen on eBay wrist pin sets for sale for this engine, but the box shows the diameter to be .636. Mine are .866. Where there different size wrist pins used on different years production of the same engine? Doesn't seem likely.
Last edited by Gdads51; 02/14/20263:05 AM. Reason: add detail to title
What BC said. Likely if your wrist pins need replacing, so do the pistons. New pistons usually come with fitted wrist pins. Those pins on eBay are the wrong ones for either a 216 or a 1957 235, which are 0.866 diameter.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
Robert - It might be that you are just misreading the box info. Piston wrist pins are listed as GM Parts Group 0.636, a part identifier category, that has nothing to do with the actual diameter of the pins.
Your 1957 235 wrist pins came in standard, .0015 OS, .003 OS and .005 OS diameters. The basic standard diameter is 0.866" as noted by Kevin above. Below is a screenshot from a 1962 Chevy Master Parts Book showing the GM part numbers for each size pin.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
The only oddball wrist pin size is for the 261- - - - -it's the same diameter as a small block V8 pin. (0.927", I believe) Jerry
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