I got a HR from Tim last year and all they had were 4/7 swap billet cores:
Grind # PO 291/296HR112+4
Has 236/241 at .050
.3823 lobe lift on both sides
112 lobe separation 108 intake centerline
4/7 swap firing order
Lobe # HR291/.3823 intake HR296/.3823B 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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