oil cooler?

[dbc112]

So I am dabbling around with a 400ex sleeve and piston in the 300ex head... Anyone who runs this (375cc kit)? If so, anyone know of an oil cooler kit? Do I need this (think I would)

[rooster300ex]

There is an oil cooler kit on ebay. If I was you I would do a search on here for 300ex oil* cooler. There are many threads on how to make the same oil cooler as on ebay just way way cheaper.

[dbc112]

How about piston clearance head etc.. I read that this is a major pia.. .