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Action4478, the HPX mod, is a High Pressure Crossover line that connects both oil galleries (one in each head) together. The purpose is even out the High Pressure Oil in both heads, since the normal set up has the ICP reading the oil pressure in only the left (drivers) head. This smooths out the idle and gives a little better throttle response.
Action4478, the HPX mod, is a High Pressure Crossover line that connects both oil galleries (one in each head) together. The purpose is even out the High Pressure Oil in both heads, since the normal set up has the ICP reading the oil pressure in only the left (drivers) head. This smooths out the idle and gives a little better throttle response.
Thanx Eh. Long day (brain fart) I knew what is was , but I don't hear much about it lately... I had it confused with the "cackle " cure in my head on the newer motors, which I hear about all the time ,,,