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| | | Forums66 Topics128,042 Posts1,055,519 Members48,424 | | 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!
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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: May 2014 Posts: 26 New Guy | | New Guy Joined: May 2014 Posts: 26 | 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? | | | | | Joined: Mar 2006 Posts: 319 Shop Shark | | Shop Shark Joined: Mar 2006 Posts: 319 | Find the engine code on the flat boss just to the rear of the distributor. This site gives a nice explanation of how to interpret the code. http://www.novaresource.org/codes.htmThis site gives more info on that generation of sixes and expands the listings of the engine code suffixes. http://no25.chuckthetruck.com/index.htmlHope this helps.
"Nothing astonishes men so much as common sense and plain dealing." - Ralph Waldo Emerson
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