Exhaust leak at the header/head flange?
Seen bad welds (pin holes) on tubes to the flange joint, leak and make ticking noise also.
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NA on E85 - 12.669 @ 110 mph (stock fuel pump)
100 shot E85 - 11.589 @ 117 mph (DW fuel pump)
JWT C2 cams rev Base Circle & Titan Valves
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