kits power pkg manifolds s/b chevy race 3500-8000 rpm super victors super ... victor 4500 #2970 #2971 designed for small-block chevys with 4500 series carburetors and ... design in dyno tests on a 358-inch small-block #2970 made 10 horsepower more than the ... high rpm or large displacement small-blocks it is cnc machined in all critical ... areas plenum chamber port exits divider walls and runner roofs for optimum ... for use with gm cast-iron vortec bowtie cylinder heads #25534351 185cc and #25534371 ... 7207 #72068 #72078 see pg 47 for gasket specs see pg 115-116 for manifold reference ... port exit allows port matching to the small port heads used in nhra super stock ...