I have a set of C90E heads on my car. They have been worked pretty good.They have Hard seats,Solid bronze guides,Manley raceflo 1.94 - 1.60 Stainless valves, studs- guideplates,Dual springs. And a complete port job and the chambers have been CC,ed. There on a 306 c.i.d. bottom end with K.B. .200 domed pistons. The car is a 85 G.T. and has a solid lifter cam,T-5, And a 8.8 with 4.33 gears and a Detroit Locker with 31 spline axles. It weighs 3290 lbs. with me in it and it runs in the 12.50 range at 108-109 m.p.h. The heads work pretty good if they are done right.
I have 351w heads that i am putting on a 302 block with high dome pistons and a mild cam. Have not done the head work yet but looking for some good guid lines to port them or at least just clean the ports up to help them flow a little better. Can you help with this.
TTT I finally got my 89 5.0 sold so I had the money for the rebuilt 306 shortblock...we're installing it next week. Anyone else with these heads...whats you ets/hp&tqu #'s