ok, i will try to lap it, also the flow from the heater core to the res. isnt that impressive, just flowing lightly, like u turned on a faucet just a little to get a sure slow stream of water, its not powerfully rushing at all. but i will take it off, and re-install it one more time to be sure, then i will try the lapping. Also, how do i tell what pressure i am tightening it to?? I just turned it until it was firm, and didnt really want to turn that easily. (nylon screw on hold down)
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