i have a 363, i race XC and 90% i dont have any cooling problem at all.....but....a couple weeks ago i had a mud race. not fun lol. mi tires were doing more spinning than i was going forward. i ended up quitting the race after two laps because i kept overheating. in not going to blow my engine for a podium finish haha. so it got me thinking....(i do have an expensive radiator. CR iirc) why not ad more capacity to the cooling system? i cant think of any reason that it would be bad. just something that crossed my mind was maybe something like a truck power steering or external oil cooler somewhere along the frame rail towards the back. run the same size radiator hose as the existing hose. providing whatever extra cooling device i used had the same ID as not to restrict flow. maybe try to squeeze another 1/2 to full qt of fluid. just a thought and figured id through it out there for discussion.