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A 331 Windsor stroker equipped with stock E7TE heads produced 353 hp. Swapping to Trick Flow's as-cast Twisted Wedge Track Heat 170 heads raised output to 439 hp and 437 lb-ft, with gains across the full rev range.

A side-by-side dyno and flow bench comparison of eleven Chevrolet LS cathedral-port cylinder heads, tested on a 408 stroker. Results cover peak power, average torque, port volume, and airflow from stock LS1 castings through dedicated aftermarket offerings.