Pontiac Firebird SD-455 Engine - New-Age Super Duty
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The cylinder heads were going to be treated to RaceKrafters' Super Mod porting, which is a blending and polishing of the bowl area. Rework of this region is the most productive in the quest for additional airflow and allows the head to remain original. When GM grinds in the valve seats, there is a mass of metal left between the final seat angle and the port. Removing this lip improves horsepower, torque, throttle response, and fuel economy. Any Pontiac hobbyist that has the cylinder heads off his engine should consider having the bowls blended before putting them back on. View Related Article
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