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@vics5 Thanks so much for this post - the only info i can find on heater core delete for s65 motor. I'm also trying to determine if looping those lines vs blocking off both is the best path. Curious if after your track events you noticed any increase in water temp with the loopback? I'm a 6mt, so no trans oil heat exchanger in the system (hose goes straight from metal pipe on back of engine to the aux water pump, then same flow from there to heater core and back to primary water pump). Would seem blocking is ideal so hot water isn't bypassing the radiator right back into the motor, but as you said, i cannot find any diagrams of the coolant flow/passages for an s65 to know if there is anything else that would be affected by blocking that flow. This is a w2w race car and i race in Arizona, so coolant temps are already a serious challenge and can't really afford any increase in temps (i have had to turn the heater on during some races when it's 100+ but i find it reduces water temps max 3-4 degrees and gets me maybe 1/2 more lap so would rather remove and reduce weight and complexity)
Thanks!
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