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I went the port & polish route on the stockers. Not sure what the specific gains are because other Mods. were installed at the same time. I agree with the other posts, not a big area for HP gains. Get that girl a cam and you will be amazed at the gains and the sound...
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Maggie 112, 228/232-595 Comp. cam, dual valve springs, titanium retainers, chromoly pushhrods, 160 Therm, KB BAP, ECS Tensioner, Pinned Crank, NGK TR-6, SLP LT's & LM-I, Cat. Del. BMR SG, Billet Shifter, BMR Loop, Synergy tune: 504 RWHP, 477 RWT.
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