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

If there are no accesories at all on the 13B short block then I think the
only way is to crack it open and examine the rotors. The S5 (89-92) have
highly machined rotors (high compression) while the S4 (87-88) are rougher.
I don't know how easy it will be to tell without having a "known"
version to compare it with however.

Ron Freier

 
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