Can anyone tell me if there is a difference between stock MC21/28 SP heads and HRC MC28 rear cylinder heads? Is the crown shape different or do they require using specific HRC gaskets and plugs?

****** list them on their website and they are slightly cheaper than the standard Honda ones.

Thanks

Scott

The HRC front head IS a stock rear head.
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Thanks. That is what I suspected, but wanted to have confirmed. With the different R & SP barrel and head configurations, I didn't want to throw another potential variable in there.