need help have 3 rx7s and want only one i have 2 85 with 12 a engins that dont work and 1 87 that dose but i like the 85 i want to know if i can put my 12 a parts on my 13b block to make n engine for my 85 if u can help please reply

 

Is the 13B from your '87? I don't think the 12A's don't have a lot of common parts in relation to the 13B, none to my knowledge anyways.

 

some ppl have done the 13b 4port with using the 12a intake iron's, cant use the rotors on 13b housing's tho, and i think it's only interchangable on the 85 and older 13b's

 

Welcome to the forum. Read the faq page( if you haven't yet) for most questions you have to see if its already been posted and the use the search button- its very helpful. Post some pics of your cars and explain why your engines don't run and then we can help you out better.