[Ed Rynex, Jr.]

Roscoe--

It looks like you have received a lot of good advice as to the cause of your problem. You went with the obvious-- the thermostat -not the problem and no obstruction in the cooling system(or is there?). I do not know what you are using for a lower hose or how old it is but with that high volume water pump you may want to consider the possibility that you are collapsing the the lower hose under high rpm conditions - running through the gears. I hope your problem is not the head gasket or worse yet a cracked head. Let us know what you find.

ERACER I