I have both series 1 and 2 heads, the series 1 design suffered from valvetrain geometry problems resulting in valve guide wear and used unobtailable guide plates. Make sure they come with guide plates then I would install bronze guides and check the geometry very closely. They also require a special roller rocker arm design on the intake I believe to maintain the geometry. Series 2 was re-designed to eliminate the geometry problems and you can still order the guideplates I think. I do like the series 2 design, but the heads are really not much better than a good aluminum inline valve head from trick flow or AFR. My plan was to flow test both designs, then port the heads and flow test again. The main advantage of these heads is the chambers are small with large quench area, which requires less timing lead for best power.
Paul
__________________
70 Camaro LA Z-28 03B Citrus Green LT-1 M-40 3.73's
69 Camaro X-77 Z-28 10C Cortez Silver M-21 3.73's Deluxe Project X - SOLD
69 Camaro X-77 Z-28 01B Garnet Red w/Black top, M-20 3.73 Deluxe Houndstooth
|