Don't understand why 1/4 of the head is not cooled when the jackets run throughout the whole head. When I check mine using an infared thermometer the temps are consistent throughout the entire head.Also I have not had any problems with my big bore kit making it run hot. If pushed hard for a long time it will get warm arounfd 200deg. but this I believe to be due to the inadiquate radiator capasity.
TOM
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