Engineer,
Check out my post, I agree that the heater core provides additional cooling, but only when the water valve is opened. The heater outlet in the rear of the head is effectively "capped" when this valve is closed and the suction side of the water pump is open to the heater core.
If your car overheated due only to the heater core being bypassed, it would seem that your cooling system may be marginal. I can't see how a small amount of hot coolant introduced into the cold side (suction) of the water pump could be signifigant. I am glad that you found a solution to your overheating problem, many don't.
Les
66 GTO Coupe,455/trips,700r/2500stall,12bolt/3.08,1.79/13.01/104.5
68GP daily driver under restoration
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Better lucky than good
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Les Iden
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'65 Buick Sport Wagon Custom, 340, T350, 3:23
'66 GTO Post/468, 700R4, 3.31 (Mike's as of 9-16)
'68 Grand Prix/455, dual AFBs, T400, 2:93 posi (sold)
'72 TA tribute/461, T400, 3.08, (Russ's as of 9-16)
'97 Mitsubishi Eclipse Spyder Turbo, Konis, 5 speed
'09 Torrent GXP, nav, Sun & Sound pkg., Bilsteins
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