Engine compatablity

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Engine compatablity

Jonathan62
I own a 81 cb750 custom,  and I just started to kick around the idea of getting a nighthawk engine (I think an 84 or newer, that has the hydraulic valves, and the oil cooler)  I'm going to be pretty sure that it's been done before, and I was just wondering how hard it really is.  Does the wiring harness need to change?  how much does the frame need to altered for the newer engine?