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Re: Question for you restoration guys and our purists?
Ideally a 12/66 Janesville truck can be located and checked.
Generally casting dates preceed engine assembly dates by a day or a little more. So if you could find a block say the 13-19th you are still doing good.
But since you have the actual date you should try to find a V1220YH stamped engine.
YH is a 49 state (without K19) 327/4bbl/TH400 auto engine found in C10-C20 applications.
They built a lot more than just your former engine on that Tuesday (the 20th) in December of '66 with that same number.
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