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PONTIAC stock Pontiac Super Duty 421v8 405hp vs stock Chevy 409v8 409hp on DYNO

78-80 C10 Big Ten With 2 in. 87-88 R10 Suburban (submodel Scottsdale, Silverado) Models with 2 3/4 in. 81-82 C1500 (submodel Sierra Grande, Street Coupe) With JB5, JD3, or JD5 Brake System 1.25 in. Koe4539 powerstop brake disc and pad kits 2-wheel set front new for olds savana 85-92 g10 (submodel beauville, chevy van, sportvan) with vacuum booster.