I'll be doing a rebuild this summer using OEM mazda parts. I want to use the mazdatrix templates to do street port. My car is an 87 NA so I was wondering if I could get some s5 rotors and just put them in since they are higher compression and lighter. Would I be able to do this without replacing other parts? If not what else would I need to replace?



BTW, with that port and s5 rotars, MSD ignition, full racing beat exhuast, S-AFC, and ported intake manifold with removed emissions how much power will I be probably making?

 

I think you just need to replace the flywheel counterweights.