I have HS 1.65 in my race motor with 240# seat pressure when the springs were new and have never had a problem revving to 6800 rpm.
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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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