1973 Pontiac Trans Am Super Duty - Brewster Green Machine
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The Super-Duty 455 was Pontiac's top offering in 1973, adding $521 to the Trans Am's price tag. It features a fully reinforced 4-bolt block, forged steel connecting rods, and forged aluminum pistons. Its No. 16 cylinder heads include 2.11/1.77-inch valves, intake ports that flow around 240 cfm at 28 inches of pressure, and round exhaust ports. Initial plans called for a 041-spec camshaft with 308/320 degrees of duration and 0.470-inch valve lift, and the combination generated 310 horsepower and 390 lb-ft of torque. Emissions concerns forced the use of the 301/313-degree cam with 0.407-inch valve lift in production engines, reducing horsepower to 290 while boosting torque to 395 lb-ft. View Related Article
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