The piece actually says, in reference to HRC parts:

"The MC28 HRC kit is nothing more than a stock top head and different radiator hose, although special heads were produced for all other models, with the 1988 and 1989 MC18's having true centre mounted plugs."

That is actually a little incorrect, as 1991 MC21 F-III heads are very slightly different to the stock heads, but the difference on their own would, in my opinion, be immeasurable.

And also, when looking at stock heads:

"There is no benefit in changing the MC18's head configuration."

Personally, I think that's quite clear, but it could still be worded a little better I guess.
_________________
Andy.
NSR-WORLD.COM

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