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- Mar 8, 2009
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- 43,222
I have the 496 manifolds/risers
The 496 cooling system is designed for closed cooling, your using raw water cooling. This could be the issue, not saying it is just the system is designed for different system water flow. The 496 system does not use restrictor gaskets between the manifold and the riser, so the water will not be able to stay full, if its not full the thermostat housing empties out some