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are they the LS6 castings? because those are what i have with the 2.055 and 1.60 valves....they are really POS heads...i actually lost 5 HP with them!!! but i will have to say that i picked up a decent chunk of grunt in the low end with them...so they "feel" faster because of the power they picked up under the curve
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1998 Camaro SS Bullseye Turbo
2002 F-250 7.3 Leveled on 20s with 35's
2006 Yamaha R6 50th Anniversary
http://www.mifbody.com/vbulletin/sho...-Update/page11
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Problem solved no more noise!!
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