Hello:
I have a friend who aquired a complete 12A and a 13B short block. He doesn't know what year the 13B is. How do you know the difference between the 86-88 and 89-91 13B. The Intake ports look like two
ports on the outside above each other, and two single ports in the middle is the only clues I can give you. Thanks.
Rich Gillen

PS Does a 12A front cover work on a 13B?

Good question. I don't know. The six port engine blocks both look the same to me.
Yes on the 12A front cover.

Paul Lamar
 
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