435crank hp or rwhp is fine...where talking going above 450rwhp. its a time bomb on boosted cars.
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This is incorrect. Cobras have an iron block. Not aluminum. Daily driven/abused Cobras with almost 500rwhp are pretty common and those engines are still in great condition. I've seen a TT Cobra with stock bottom end, heads and cams make 873rwhp on race gas. Conservative street tune was in the high 600s.