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it increase the runner length from the stock 3.4rwd 2in runner, to this 3400fwd 8in runner. The longer the runner the more air charge accelleration, there for increasing the effeincy of the cam I got. not to mention by swaping the heads I'm increasing the intake valve to a 1.76in valve. There should be some decent numbers soon to come. I'm expecting low 14s and POSSIBLY, not saying it will happen but tweaking the computer right I think I can hit 13s.
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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