The answer to tubbed is no I don't run a shroud. I previously stated run a 4 row(core )high density rad, 185 themostat with a 16th inch hole drilled in it facing the rad, electric water pump and electric fan(pusher). I don't have a belt or crank driven fan. I raced last Fri. and it never overheated. After each heat I shut the engine off and just let the pump and fan run for about 5 minutes. As far as cruising if I don't push it, it normally runs between 180 and 200 which is A OK! I would love to try some water wetter but Summit won't ship to Canada and I have yet to find a Canadian distributor. Someone down there want to send some, can make arrangements.