Quote:
Originally Posted by Formulajones
I've never found any need to modify the coolant passage for heater cores on E heads, or any other brand for that matter, never blown a heater core.
But if you have extra time and really feel the need then what formula mentioned sounds like it would work.
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Yep. Mine ain`t restricted and I have spun my engine to 6000 to 6400 many times without problems.