Don Norton
Member
running extra coolant lines to the siamesed exhaust port area can provide marginally better cooling in that area, it was a rather common mod or road racing cars that spend a great deal of time racing well above 4500 rpm.
I have a 406 sb chevy that I just built. This time I put some aluminum heads on it (Skip White NKB-272-SH). I put the mechanical temperature probe in the stock location in the right cylinder head. I also have am MSD Atomic fuel injection on the motor and I installed the temp probe just under the thermostat in the Z28 factory manifold. Once the motor warms up to operating temperature the MSD is reading a perfect 180 degrees but the mechanical gauge in the head is reading 190 to 200 degrees. The motor is setup with 10.8 compression, KB Hypertereutectic pistons, Crane H-272-2 cam, 6 degrees advanced timing, 14.7 A/F. Flex-A-Lite 292 electric fans are set to come on at 180/190 degrees. The fans pull 4600 CFM. Would a bypass show above help bring down the head temp?
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