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LS Cylinder Heads – Mast Motorsports High performance premium cylinder heads and components for LS & LT applications. We design and manufacture a large line of cylinder heads for LS1, LS3, LS7, LS9, LT1, LT2 & LT4 engine platforms. If you are looking for more power and better performance from you LS or LT engine, look no further. LS3 Ported Head Comparisons – WEAPON-X Motorsports Mast Black Label LS3 (Large Bore) Retail price: $3,198 Intake valve size: 2.20 Exhaust valve size: 1.60 Intake port volume: 270 cc Exhaust port volume: 93 cc Chamber volume: 70 cc Peak power: 761 hp at 6,500 rpm Peak torque: 645 lb-ft at 5,100 rpm Average horsepower (3,500-6,700): 596.1 hp Average torque (3,500-6,700): 609.1 lb-ft LS3 Large Bore | Factory Mast | As Cast Port | Cylinder Head ... Mast refuses to compromise on materials and methods that may jeopardize longevity, performance, and quality. When buying Mast Cylinder heads, you are getting the highest level of quality and performa...