okay, so the heads are here....and need to be fixed.

whats the course of action?

if it was going to be more of a hot street build, or restification with headers and perhaps an aftermarket intake manifold i would have opted for oversized valves to restore some of the valve height in the chamber.
but its really just more of a restoration deal, with manifolds and OE induction, and i didnt feel there would be enough benefit in performance(or any benefit) to justify the expense of new valves.

the seat runout was poor enough, and the placement of where the seat interfaces with the valve was pretty "high" on the valve face that it would end up requiring sinking the valves roughly another .015" before everything cleaned up.

i followed that with a plunge cut into the chamber to unshroud the valve, and a 75deg bowl cut, leaving the bottom angle about .100" wide.

then i blended the bowls, bullit nosed the guide bosses, and knocked the intake short turns back.
with a back cut added to the valves, i ended up with this:

lift----I/E
.100--71.2/55.3
.200-150.5/102.5
.300-210.5/138.9
.400-247.7/168.9
.450-251.5/180.3
.500-256.1/185.1
.550-248.4/189.2
.600-246.5/191.8
.650-245.8/194.3

this is the same two ports, and the same valves, after "fixing" them.

gains:

lift----I/E
.100--28.8/10.0
.200--53.7/16.1
.300--56.7/13.9
.400--48.0/22.3
.450--40.3/27.4
.500--39.1/26.6
.550--25.7/26.6
.600--18.0/27.5
.650--13.5/29.2

thats some serious gain in flow from .500 and down.....which has got to make a noticable improvment in power.....since it came with a very minimal increase in runner volume.

hopefully the rest of the motor will get looked over, and any problems addressed.....which should keep this car out of the dreaded "16 second zone".


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads