We use them quite a bit in customer's cars. Our experience has been that they do well behind 400 or so HP or lower applications. For larger, higher horsepower combinations, we haven't had much success. Despite putting really good internal parts in them, they just didn't hold up long term. In those applications, we've gone with 4L80E's.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs
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