Quote:
Originally Posted by Captainfab
I think what they are meaning is that the L31 Vortec heads do have the same coolant passages as the '55-'95 heads with the exception of the thermostat bypass hole. Thus the need for an external bypass. I brought this up here on this forum nearly 6 years ago and the general consensus was that it did not matter as long as a heater core was plumbed into the cooling system.
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I agree IF the heater core is constant flow & doesn't use an on / off valve in the hot hose from the manifold.
I remember having to change the hot water control valve on the boss's 99 Burb, it had four hoses on it & that coulda been to provide bypass cooling when the heater was turned off. But it was also a rear air / heat truck also w/ gobs of plumbing for that.