Have you bled the system of air bubbles yet? Sounds like you have a air bubble or pocket in the cooling system. There is a bleed valve on the upper thermostat area, so give that a shot and it should fix your problem and return temps back to normal.
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335whp 373tq (for now)
Stage 2, SST, Built Motor/JMB Race Ported Head, Nitrous, SB Stage 5 Clutch and alot of goodies...
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