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Old 11-22-2009, 09:46 PM   #4
Dog Is My Copilot
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Drives: 2011 2SS/RS LS3
Join Date: Jun 2009
Location: Pittsburgh, PA
Posts: 1,394
FWIW, Texas Speed recommends the 418 over the 427 if you're planning more than 10 psi boost or more than a 150 shot of nitrous. The 418 is a shorter stroke which allows the use of a more substantial piston for higher boost applications...
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