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I thought lead was just there to lubricate the valve seats. If the car isn't revved much then it really shouldn't need the lead additive. Octane booster would probably work better, but 11:1 should still be fine on 93 octane. The car might be off on timing or running too hot.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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