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As far as compression goes my 417 is 9.5:1 and have good results with it. I run nothing but 93 pump gas and no meth so it's more of a safety factor for me being mainly a street car. I know a lot of people like more compression but ADM told me 9.5:1 so I said ok, no problems here.
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MODS:
ADM built 417, 2.9L Whipple with 3.250 pulley, ADM ported and polished LSA heads,ADM stage3 cam,ADM LSA belt drive system,ADM CAI race scoop, ADM dual fuel pumps, ID 850's, BMR full suspension, Gforce 9 inch kit with 3.5 inch driveshaft, Street Slayer twin carbon clutch, Lingenfelter oil seperator. Tuned by built by ADM Performance, 763rwhp,705rwtq
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