Originally Posted by Oilrag
Casting # 3851659 is listed as a 292 from 1963-66
and had 7/16" Bolt Holes in Crankshaft Flange.

Starting in 1967, casting # 3851659
had 1/2" Bolt Holes in Crankshaft Flange.


I'm sorry, but I have to ask again.. The casting # you refer to are the same..

This is what I find when I look it up:

3851659 Chevrolet 63-76 292

So I do understand it's possible it is from '63-'66, but what I don't understand is how you guys know/say it's not a newer model.. from for example '66-'76

Thanks a lot it is a big help you give!

Thank you!
Kaad