I removed the clutch and factory 7 blade fan and replaced it with a 7 blade direct drive flex fan. Not noisy at all on the highway, or down the track. Put the same set-up in my brothers car with 530 Hp and a 3 core radiator and it runs the same temp.
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1967 Firechicken, 499", Edl heads, 262/ [email protected]" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. [email protected] mph with a 1.45 60'. Still WAY under the rollbar rule.
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