Thank you Jon for the tidbit on the thermostat. Information like that about the size on the Robert Shaw thermostat opening is very helpful. I had read that the Shaw thermostat was the best but couldn't see why one brand was any different than the other. Had also read that sometime slowing coolant flow was beneficial. Bingo! Shazam! Autozone on the way home. Thanks again. David
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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