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I do have my bypass hooked up
Undy I do have my bypass hooked up. Any motor is going to spike temp until the spring on the thermostat gets weak and lets the flow of coolant go through the housing. As long as you are not hitting 220 temp don't worry about it. My temp gauge is like a yo-yo until it stabilizes. 200 -160 in 3 seconds. Until all the coolant is within 10-15 degrees of your temp spec on the thermostat housing you are going to get spikes. The problem with my car was worse with the underdriven pulleys. I am sure the Gessford thermostat works perfect with the 4 holes. I would think that mounting it with the holes at 12 & 6 would help remove all air in the system if you don't have a vacuum pump to use on the coolant system. I used this the last time It's works great. My march pulleys where underdrive, My fault on that info. Also run a edelbrock waterpump with the shield that is riveted to the impellor for more flow. Rick L.
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