[Christ]

They have a kit for the SBC motors that actually bolts on to the block, replacing the OEM water pump, and the motor is an integrated unit (no maintenance, throw it away and get another one). I don't remember the cost or any of the details, but they installed one on HPTV awhile back, and IIRC, it netted like a 7HP gain at ~5kRPM.

Not that that data would have much to do with a real world scenario or FE gains. But I think there is also a Honda kit, and several other kits that are engine-specific. (The Honda kit that I saw, was pre-production when I was checking it out, never found out if it was produced or not, nor saw any tests on it, but it had a OEM pump replacement, to keep the timing belt sitting correctly, which was just a housing, then used a pump on the water pipe on the back of the engine to actually flow the coolant.)