Building A IA II Boosted Engine - Twin-Turbo Tail Twister
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The valvesprings feature a seat pressure of 140 pounds and an open pressure of 360 pounds. Since this engine will rarely, if ever, see the other side of 6,000 rpm, they suffice. A set of Comp Cams 1.5:1-ratio aluminum rocker arms keep valve action in order. Smith Brothers 3/8-inch diameter, restricted pushrods with 0.040-inch holes were used so that full oil flow could be maintained for the lifters, yet still be restricted to the rockers. View Related Article
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