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dual Manley NexTek valve springs with 1
While great parts are necessary for a great build
the result is a crankshaft with the lowest coefficient of drag in the industry
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CNC Ported AFR 12 Degree, 6-Bolt LS3 Cylinder Heads - Assembled Exhaust Valves:Stainless Steel dual Manley NexTek valve springsAFR Mongoose LS3 heads heads bring a lot to the party with their 12 degree, 6 bolt design. We buy these heads as porter castings and machine them to perfection on our CNCs. The shapes we impart to the ports and combustion chambers reflect our years of experience on our own engine builds. We know what makes power and also survives the beating of competition. It's not chasing peak air flow at max lift by excessively cutting away the metal around the
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