no true flat top piston with 670 heads will give 9.48 compression. using a dished piston might, but there is no flat top one that is not custom which will work. so that said, means you need higher octane gasoline and richen the mixture. If a box fan in front of radiator does not lower temps, a change in fan type or blades will not be any better. IR gun the entire radiator and see what the temps are from top to bottom as well as top and bottom hose. I suspect hoses are collapsing and water flow is restricted somewhere. also check temp on heater hoses as well. you are running a heater?
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10-10-2006, 01:00 AM
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