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Can a head that's been ported for manual compression releases be used on a new bike already equipped with ACR's? Do any changes to the head need to be made?
 

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Can a head that's been ported for manual compression releases be used on a new bike already equipped with ACR's? Do any changes to the head need to be made?
No. Manual releases vent through the valve. ACRs vent through a passage into the exhaust port.

You could use the heads with manual releases and disable the ACRs in the ECM. Assuming the front head also has the boss needed for the front engine mount.
 
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not really understanding your question,what does porting have to do with either type of c. release? do you mean heads that have been MACHINED for MCR`s?if so,like rage said,just unhook the ACR`s and run the MCR`s.might be better off just finding ACR heads and have them worked
 
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