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A decent h/c package will conservatively increase hp by at least 100 RWHP. You can realize much more with wilder cams and more detailed porting.
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2001 SOM Camaro SS - T-Tops, Neutral Leather, ASR, 6spd Hurst w/LSS. Build #4843 422 RWHP 405 RWTQ
MODS: Suspension stuff, intake, exhaust, H/C, AR TTM's 
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