I have heard a lot of people say that 400's overheat to easy because of the lack of spacing between the cylinders. Do any of you guys offroad/crawl with a SB400? Is there anything you can do to fix the problem? I got the engine for free and I started thinking of rebuilding but I am afraid of the overheating issue. I have heard of reverse flow water pumps but I don't know. Some direction would be cool. Thanks.