My brother just installed the high tuck 2.5" system in his '70 A body with 20" Super Turbos and the system is very impressive. Starts with 2" Doug's headers and has excellent ground clearance. His only gripe is he thinks it's too quiet, but he's used to the race car exhaust.
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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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