If anybody uses an aftermarket water pump like a Edlebrock make sure when fitting, You first remove the rear plate {chev] and sealastic the CORK Gasket as i was on the M5 motorway  when the gasket pushed out and almost cooked the engine as it pumped out all the water at 70mph, lucky SMS was just down the road as chris came to my rescue , removed the water pump went to EAGLE AUTO spares and bought a GENUINE pump, RETURNING the edlebrock pump for warranty to rocket ind.