+0.50" locks will raise the retainer 0.050". As advised before, if you have your guides cut down for positive seals, always lower them as much as you can go to give you flexibility to change cam lift later on.
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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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