What size, year Engine will go into a 1985 Mazda Rx7 GS? and what will i need to make it happen? elec. harness. what will happen?

 

Try the engine from a 1985 RX-7 GS, I hear they fit awesome.

 

are you thinking about swapping in a piston engine, is that what you're asking or another rotary?

 

If I'm reading your post correctly, you're looking to do a Corvette LS series engine swap. We have a separate sub-forum listed below for that.

https://www.rx7club.com/other-engine-conversions-non-v-8-118/

If I'm wrong, then you need to provide more details about what you're wanting to do.
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How can i get more power out of the engine in my 85...can i put a different RX7 engine in it? or do i have to put a whole different engine in it? and what will i need to make this happen?