Before this gets moved to a different location...

Some F3 rads wont fit the stock MC21/28 not due to their shape for fitting but the fact they need the HRC water pump etc.

If your looking for a 3 core HRC rad to fit an other wise stock motor about the only one that will fit is a '94 HRC MC28 rad.

Jamie has one on his site at the moment up for £650 I think.
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If I have to take the carbs off once more...