I set my heads up. I don't think you have to worry that it's a quality control issue, I clearly saw a defect in the metal that was the spot where a crack initiated, and I think it was a fluke as the open pressure was only 720#. I have since run CC titanium retainers without issue.
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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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