A New Post has Been made to the thread [do the 80\'s rx7 13b engines work easily w/ a 74\']
User From: brad
The Reply was:
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If you really want a 4 port 13b, you can also get a 12a, dissassemble it, and use it's front side, intermediate, and rear side housings. Get a Rx-7 GSL-SE 13b and take it's rotor housings, e-shaft, front counterweight, and flywheel and assemble the motor with the REPU front cover and oil pan. Now is a great time to take your REPU rear oil pressure regulator and shim it 1/8" and to get 80-85 PSI oil pressure (stock is 70).
Keep in mind the intake ports on the Rx-7 are smaller than the 74-75 tall intake ports. So the frankenstein motor will make less power. Unless you take this excellent opportunity to port the intake and exhaust ports and make some good power!!!
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