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You will need to flycut with the MS4, and the TRex will be damn close with PTV clearance. All those cams are too big for stock 243's IMO. I think you would net better power and torque with a smaller cam if you dont plan on touching the heads.
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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