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Old 01-22-2013, 01:24 PM
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cobalt327 cobalt327 is offline
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According to Sam Weiss' flow sheets, the L30 305 Vortec head flow respectably even unported: 221 cfm int./163 cfm exh. @ 0.500" lift/28" water. Better than all but one professionally ported 416.

Needs springs/retainers, a Vortec intake, center bolt valve covers, and either self aligning rockers or adding screw-in studs and guide plates to use standard rockers.
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