![]() ![]() Pontiac Engineering developed excellent cams for the various applications they were faced with in the glory days of the first musclecar era. Race-engine cam design and usage is significantly different and will be touched on only briefly.Ĭams are vitally important to an engine’s performance, and a cam change must be carefully evaluated in order to obtain the expected benefits. ![]() I’d like to discuss basic camshaft operation, nomenclature, and application information for cams in Pontiac street and street/strip cars as well as the results of the cam changes on the LeMans wagon. “Performance”, as used in this article, includes idle quality in the 550 to 700 rpm range, throttle feel, and driving ease, in addition to actual quarter-mile elapsed times and speeds. I recently tried several custom-ground cams, and I want to share the results with you. I’m always trying to improve the quarter-mile performance of my 1971 455 LeMans wagon, while retaining derivability, a 3.55:1 axle ratio, and a 5,500-rpm shift point. ![]()
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