Re: timing chain part number differences
Raylube:
I know enough to be dangerous. Only difference I have seen is that the early chain is the type that goes on gear sprockets vs. the one you have that looks like two bicycle chains together that goes on double bicycle sprockets. I don't believe there is any difference between the 305 and 351 other than the two different type of chains. When you get to the big V6's like the 478, they had a three gear system instead of chains.
hope that helps. Others with more details (especially Bigblock V6- Pete Chronis) can give you more details.
Regards,
Steve
New Orleans
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