I found out the 1986 13b in my sandrail is blown and found someone local with a 1985 13b he'll sell me and am wondering what the differences are? I know compression is the same (9.4) and the rotors are heavier in the 1985, which affects how smooth it accelerates from what I understand, but are there any other differences and should hp be about the same with my dellorto 48 DHLA and custom exhaust ( only about 18 inches long before the muffler including the y pipe and yes it is pretty loud :-)?

 

http://www.rx7club.com/showthread.php?t=202653

thats a link from "the other site" as people call it lol. practically from what i understand the 86 13b is better all around from the lighter rotors, bigger ports, and something about a dynamic effect intake. since your 86 is blown, im guessing not much is salvageable from it. unless its just the seals, then i would just replace those. supposedly the 86 put out 10 more hp. if the housings aren't salvageable, i would take the rotors, and the dynamic intake effect thing. other than those things, i would say that they are practically the same. i would read more on that thread though and see what you can dig up. i only read the first couple of posts.