Chevrolet HT 383 Engine - The Twister, Part III
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The far left spring is the stock Vortec iron-head valvespring. Next right is the GM Performance Parts LT4 valvespring that we used with the 1.6:1 rocker arms. Third from the left is the Comp PN 986 dual spring that Comp recommends for the XE282HR cam. The far right spring is the Comp 977, which offers a higher rate. View Related Article
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