Things really get interesting with the EZ casting treated to Indy's full Windjammer CNC porting of the intake, exhaust, and chamber. Measuring in at 295 cc, the Indy 440 EZ-295 CNC, affectionately called the Little Easy, scales intake port flow up to a lofty 355 cfm, while still utilizing standard factory-spec rockers. The fully CNC-ed Little Easy, at 355 cfm, was just too tempting for us to pass up in our project, offering awesome power potential, simple installation, and plenty of port volume to make our 446 really come to life. For bigger inch stroker or higher-powered applications, Indy has an even larger version of the EZ available, the 440 EZ-325 CNC, called the Big Easy. With a 325cc intake port, the Big Easy utilizes the offset intake rocker arrangement of the original Indy-1 heads. Like the Little Easy, the Big Easy receives the full Windjammer CNC treatment, and flow is through the roof at 370 cfm. For the popular stroker combos being built these days, this cylinder head offers the flow potential, volume, and cross-section to make serious use of the available displacement. Both the Big and Little Easy full CNC ported heads are designed to oil the rockers via Indy's convenient external oiling system.
Making the swap to any of the Indy heads requires the factory style intake "bathtub" gasket be replaced by the Indy valley plate. The separate valley plate offers improved sealing of both the block's valley, and the intake manifold. The use of individual composition gaskets (supplied by Indy) to seal the intake manifold facilitates fit and alignment when milling has been done to the block, heads, or both. Two configurations of the valley plate are offered: Indy's one-piece PN 440-6 R/B, or the PN 440-6R R/B that includes an access plate. Since the valley plate becomes captive when the heads are installed, we prefer the latter, which allow access to the lifter valley in the event of a cam change or other maintenance. As mentioned, the full CNC-ported versions of the EZ requires the Indy external oiling system, which is simple to set up and plumb.
Though the Indy heads are offered fully assembled and ready to run, we elected to go with our choice of Comp's new beehive valvesprings (PN 26120). We've seen the beehives in action on other applications, typically hydraulic rollers, with impressive results. We have witnessed these springs dramatically increase rpm potential, while running at a reduced spring load, and were eager to give them a try in a Mopar flat-tappet hydraulic application. The beehive springs reduce spring mass, and the winding design makes the springs much less susceptible to harmonic spring surge, a primary factor in loss of valve control. Installed at 1.900 inches, the springs will provide 148 pounds of seat load, and 369 pounds of load over-the-nose with our cam combo. The Comp springs were installed with the required special retainers, and a set of Comp SuperLocks for the Indy 111/432-inch stem valves. Our cam combo would put them to the test, with the extraordinarily fast Comp XEHL hydraulic flat-tappet cam, and our selection of custom 1.7:1-ratio Harland Sharp rockers. With only 231-degrees of duration at .050-inch lift, our combo will open the valves to a maximum of just a hair under .600-inch, representing a very demanding combination. The aggressive number 5964 lobe our custom cam is based on may seem short on duration when the .050-inch number is quoted, but the duration at .200 inch is a healthy 149 degrees. We were after a short duration/high lift combo to maximize idle quality and vacuum in a tame street application.