400ci small block fuellie heads which cams should be used

The engine detonates only when you switch it off and when its very hot ( either the engine or outside )i also fitted a new radiator as the omd one had been poorly repaired .
 
check for vacuum leaks and carb throttle blades that don't completely seat when you let off the throttle,
A carburetor that does not completely close can contribute to running once the engine is off, since the extra fuel and oxygen mixture can combust easily in the warm piston chamber. Similarly, hot vaporized oil gases from the engine crankcase can provide ample fuel for dieseling.
 
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