s4 na 87 gxl
 

could a 13bt s4 engine bolt up to my stock tansmission and run with out any problems also would it matter if the enigne is jdm or usdm

First your title sucks. When posting here, post a real thread title that describes exactly what you want to discuss.

2nd, your questions have been covered quite a few times and very in-depth before. Your failing to search or look through the FAQ for FC sticky thread (https://www.rx7club.com/2nd-generation-specific-1986-1992-17/frequently-asked-questions-2nd-generation-rx-7-faq-fc-494667/) found at the top of this section is very insulting to many of the long term members. I hope you don't get too much flaming for it. In your next post in this thread you should probably apologize and say you will try harder to search and read the FAQ for FC sticky thread before posting again.

3rd, the engine won't bolt up with changing numerous parts including the flywheel, clutch slave, starter, etc, as well as wiring and ECU issues.

4th No it wouldn't matter if the engine was JDM or A Spec, as they are fundamentally the same with the exception of minor emissions differences.

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