It's amazing that the Edelbrock pump can make enough pressure at the thermostat to keep it closed. I've tried to muscle t-stat's closed before and they generally have a fair amount of pressure. Plus the pump isn't anything more than a splash type pump, like a TBI pump with much greater clearances. But I guess .08 in sq of opening added to the 'stat made a large enough difference. How did you determine pressure was forcing it closed?
All you need to get the 'stat to open is enough warm coolant to provide a signal. Ever look at the front of an Olds 350 / 455 intake? I'm really surprised none of the manufacturers have built the bypass in using that method and a different coolant outlet and supplying a block off plate if the bypass isn't not needed. Wishful thinking, I guess.
People get excited about drilling holes and tapping the manifold for a bypass but why not use a thermostat spacer?
http://www.behrents.com/c/Cooling-HousingThermo.html
No, the pump doesn't lend itself to easy drill and tap procedures.
Do you have a restrictor on the heater hose from the inlet pipe?
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