ok, have a 454 with a berkeley jg pump. new packing gland and transom sealed. at idle there are no leaks from pump or cooling lines. have a valve at inlet line and outlet, both are fully opened. problem at idle the motor heats up to redline but once going its fine. is this because there's not enough water circulating? and then when the water can get through the headers it flows more? other problem is when not at idle (usually above 3000 rpm) there is a leak coming from somewhere. and its a pretty good one. my guess was a hose or something leaking when theres more pressure but I can't find anything wrong. any help....its driving me crazy. nothing like letting off the throttle and have a river come down the center of the boat. thanks for anything ya got