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I know SLP makes heads, probley one for that appication. Like he said you will need a bigger tank. I am not sure on what he means by drillin out the case, but I know its NOT the chaincase. I think you have to drill out the head. I believe its for coolent flow. You might want to PM pockets, he knows his Polaris sleds. Hope this helps.
 

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you drill the case for more oil flow to the bearings on the crankshaft. there were problems with the '04 center bearing seizing up if there wasnt more holes drilled in the upper case half. i dont own an '04 but this is what ive heard is the problem.
 
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