Originally Posted by lowhirod
has any one used the Edelbrook 60979 E-tec 170 aluminum heads in a votec head swap?
According to tests here: Street-Style Vortec Head Test - Tech Article - Chevy High Performance Magazine
, the E-Tec made 17 more peak HP and 6 ft/lbs torque at peak (408 hp/437 tq) than stock unported Vortecs from Scoggin-Dickey modified for more lift and w/stronger springs (391 hp/431 tq). Average gains: E-Tec made + 8 hp and + 3 tq average.
Cam was a Crane hydraulic roller p/n 119831, duration 222 int./230 exh. @ 0.050" lift, 0.509" int./0.528" exh. lift on a 112 LSA. 750 cfm Holley on an RPM Air Gap rip-off.
Why they used 36 degrees total timing I can't say. Nor did they say they adjusted the timing for best power. Usually Vortec heads do not want that much timing.
"Average HP per dollar" was $2.24 for the iron Vortecs, $3.63 for the Etecs, ca. 2009.