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That because Gm learned that in certain engine applications using camshafts with more valve overlap when the Intake and Exhaust valves are partially open at the same time can Lower Emission's.
Same Reason and situation with why the LS-1's in 2001 no longer used EGR Systems the LQ4 Vortec truck cam had more advance, less timing and the camshaft had more overlap which in turn created lower emission's.
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2002 Z/28 = Firemutt Racing 370 w/ Cam, Trick Flow heads, TPIS 90mm Intake & 90mm T.B., Vigilante 3600 t.c., Michael's Transmissions Built 4L60E.
QTP Headers, Mufflex Stainless Y-pipe, Pypes Performance Exhaust, Moser 12-bolt w/ 33 spline axles,Truetrac & 3:73's., Spohn.
Cartek Tuned...
Last edited by ins0mnia24; 11-08-2008 at 03:31 PM.
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