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    Pcm 300 plus vs excalaber 335

    How is PCM getting more hp out of the 5.7 vortec ie. What is different between the 300 plus which has a 600cfm carb and the 335/343/ excalaber which uses fuel injection. Both are 5.7 vortec engines, different exhaust manifolds? different camshafts? I know if you ask PCM directly they won't tell...
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