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On to the top end. With the Cam installed I focused on the the Heads and valve train.

The heads are factory 327, 3917291 castings, they were available for the 302/327 and 350 from 62'-69'. These are double hump 64CC chambers with either 1.94 or 2.02 intake valves. My factory heads were 1.94, I had my machine shop open them up to 2.02, adding hardened valve seats and stainless valves. The exhaust valves are 1.60. I have blended the chambers slightly and matched the gaskets on both the intake and exhaust ports.

In addition to having the hardened seats added I had the heads machined for screw in studs and Manley guide plates. The heads were surfaced and the valve guides were also replaced. I CC'd the heads while blending the chambers, after being surfaced the chambers averaged 59.5 CC's. With the pistons I have chosen the compression should be close to 10.5 to 1.

The heads were reassembled using hardened retainers and locks, I used Edelbrock "Sure Seat" valve springs. The valve springs are dual coil rated at 110 Lbs seat pressure, 285 Lbs open pressure at .490" of lift. These are installed at 1.7" seat height with 1.160" coil bind. I chose Speedway stamped steel roller rockers, 1.6 intake and 1.5 exhaust ratio. The 1.6 ratio intake will add 200 RPM to the top end. Along with the rocker arms I selected Speedway's 5/16" Chrome Moly push rods.

Again all hardware was from ARP.