My '72 LeMans ran at 160 °F today with an outside temp of 72 °F, on the highway running 70 mph. I used to run a factory 7 blade fan with a Hayden clutch, 160 °F Tstat and it would get over 200 °F idling on a 90+ day. I took the stock fan/clutch out and replaced it with a 7 blade flex fan and it would not get above 165 °F on a 90 °F day. I changed the Tstat to a 180 °F and now it gets up to 175 °F on a 90 °F day. The heat is hot even when it's running at 140 °F on a 50 °F day so it is opening. I am going to try a 190 °F Tstat to try to warm it up.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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