I fixed the pickup tube expecting it to resolve the pumping problem, by priming the pump properly, but still have the same issue. There’s no flow (or spitting) from the exhaust bypass, even when the thermostat is removed. When I looked at the factory parts diagram the ’67 water pump looks like a 3 bolt mount, so I can only assume that the l/u was replaced at some stage and that the parts are interchangeable. My last option is to pull the powerhead – if anyone here has other ideas I’d greatly appreciate them?
