Quote:
Originally Posted by lust4speed
Pontiac heater nipples were restricted down to a 1/4" and they wouldn't have wasted money in doing that if there wasn't a reason
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Oldsmobile restricted their heater supply, so did Chevrolet.
No promises on Buick and Cadillac, but my guess is that all GM divisions restricted the heater core flow somehow. Either a small hole in the heater supply fitting, or a restriction built-into the heater core inlet tube.