Originally posted by wolverine_sr24
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731 head works just fine on the eta you keep the same compression ratio since the chambers have the same volume. but you need to keep the B20/B23 cam and valvetrain. You cant use the ETA cam, since it only has 4 journals and not 7 like the I cams. for Ljet cams (B23 and early B20s) you need to modify the front of the cam, to be able to fit the motronic distributor thingy. for late B20 cams thats not required since those use motronic aswell.
If you dont change the setup on your ECU, it wont work nice with the I cam, because that cam starts to wake up just when you hit the rev limiter.
If you reprogram your ECU, a 731 head will flow good enough for ~170hp. It wont be as good as a 2.7 stroker with 885 head due to the limited head flow, but still WAY better than the standard ETA.
I hope this helps you out, and let me know if you need to know anything else. good luck with your build.
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