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Old 08-31-2011
fastbob49 fastbob49 is offline
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Join Date: May 2010
Location: Rockwall TX
Posts: 12
Default 420s engine

Engine is stock gt engine. Bottom end is not forged. You can go to 3.4 pulley without fuel pump upgrade. With gt500 fuel pump you might be able to go to 3.0 pulley. After that you need forged bottom end and heavy duty clutch.
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