My 65 C10 has an inline 6 that is not original to the truck and I would like to figure out what engine it is. The casting number on the block is 3921968 which I have determined means it is either a 230 or a 250 from a Chevy or Oldsmobile. Where do I go from here? How do I find out which one it is?


1965 C-10 Longbed (soon to be Shortbed) Fleetside
230-6banger, 3 on the tree
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