1966 Pontiac Bonneville Convertible Engine View
In 1966, only 984 Bonnevilles were equipped with the code-YJ Tri-Power 421 engine and a Turbo 400 automatic transmission. Featuring factory ratings of 356 hp at 3,800 rpm and 459 lb-ft of torque at only 3,200 rpm, this full-size luxury musclecar pulled hard from the factory. As part of the driveline restoration, the Tri-Powered beast was pulled and rebuilt to quench its thirst for oil.
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