Quote:
Originally Posted by caddor38
So folks, I know its Christmas but I am bored and decided to list all the sites that document my 455 block casting number 483677 as an HO block. For all of you folks saying this is a non- HO block please send an email to the sites listed below.
Wallace racing list the 1971 casting 483677 as an HO motor
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It is a nice block and probably worth your price; but the evidence points to it not being an HO block.
You seem to focus on 483677 as an HO when convenient and YC as HO with other sites. You have to use the two numbers together to identify what you have.
The Wallace racing site clearly shows that a YC coded engine with a 483677 block code is not an HO block.
Between these forums and the Wallace Racing site, you can get as close to a definitive 99.9% answer as is possible. I wouldn't rely on any of those other sites for Pontiac code information. In fact, I've never heard of most of them. I have bought lots of parts from the Butler's and will continue to do so, but their parts code info is incomplete to incorrect.