There is not time limit on what you can do re head gasket. But you have to consider what extra stress you are putting on the engine when operating at top capacity. If the cooling system is not up to the stresses, you will over heat pronto. The oil you use will be a factor, just as long as you realize that racing will tax the engine to the max, and that is when things fail.
Thursday, November 29th, 2007 AT 11:51 PM