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Originally Posted by 440GP69
IMHO flex fanx are junk, HD clutch fans work fine if everything is setup properly and make about 15-20hp more, Thermostat??? since you have a fan shroud and your radiator isn't possibly plugged up and you advanced your timing, carbs seem to be in line, you don't have a flow cooler water pump, have you made sure you have the right clearance between the water pump divider plate? also have you tried any different guages to make sure the one in the car is accurate?
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Yes, after reading the various comments on this forum about that little diverter plate dimension mod, I pulled the water pump (and found it had started weeping even though it had no more than 100 miles on it) and brought the dimension down on the plates from around 125/140 thou down to about 40/45 thou and of course, replaced the water pump. The temp gauge is a mechanical/capillary line type by Autometer and I get the same readings with my Raytek IR gun.