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Indy's EZ-1 Cylinder Heads

Big-Block Mopar
Posted January 4 2013 09:02 PM by Johnny Hunkins 
Filed under: Tech

Indy 440 EZ-1 cylinder head for big-block Mopar

As PHR’s Project Valiant begins, we take a close look at our chosen cylinder head: The Indy EZ-1.


In the Mopar world, there are few equals to the experts at Indy Cylinder Head; the Indianapolis-based manufacturer has a long resume covering both the building of Chrysler crate engines, and the design and manufacture of high-quality Chrysler engine components. It's well acknowledged in the racing world that the Indy name is synonymous with winning Mopars. Where most companies would typically focus on just building engines or manufacturing components, Indy has excelled, and arguably become the de facto expert in the field of Chryco power. What’s perhaps most telling is Indy’s wide range of product coverage, whether it’s individual components for a budget-oriented small-block, or a state-of-the-art, all-aluminum turnkey Hemi crate motor. There is no corner of the Mopar or AMC world that Indy does not service, and that makes the brand truly unique in the performance world. Mopar enthusiasts are lucky to have Indy in their corner to even up the playing field.

It is for this reason that we reached out to the experts at Indy Cylinder Head to tackle the engine build-up in our newest project—a 1968 Plymouth Valiant A-body. At the heart of the lightweight Valiant would be a 500ci all-aluminum Wedge based on a low-deck version of the Indy Maxx aluminum block. This would be topped by a pair of Indy’s 440 EZ-1 cylinder heads, pictured here. There are four versions of the big-block 440 EZ head, ranging from as-cast ports (270cc) to large CNC ports (325cc). All four versions of the 440 EZ head retain the stock exhaust port and pushrod location, but you can opt up with beefier rocker arms, a Max Wedge intake port, and offset intake rockers. Your displacement and power goals will help you determine which to choose, and the experts at Indy can help you decide. The primary advantage to the 440 EZ series of heads is that the stock exhaust port location and flange size makes it compatible with many existing headers and exhaust systems, a big factor whenever considering a big-block swap into a small A-body engine compartment. 

Indy's 440 EZ-1 cylinder head with Indy-specific T&D shaft rockers (offset intakes).


The EZ-1 head for our Valiant’s engine is the “Stage 2” of the four EZ versions, and it features a long valve stem design (for high-lift cams and zero coil bind), a CNC port-matched 275cc intake (Max Wedge size) with CNC bowl work, 75cc closed chambers, and 2.19/1.81-inch valves. With our CNC’d intake ports, we also opted for the Indy-specific 1.6 ratio T&D rocker arms with offset intakes—it’s a shame they must stay hidden because they’re a work of art! These rockers are actuated by a flat-tappet solid-lifter cam from COMP Cams having 245/251 degrees duration (at .050-inch lift) and a modest .556/.573 inches of valve lift on a 108-degree lobe separation angle (grind # CRB3-6579-6584-S108).

The EZ-1 heads were mated to an Indy Mod Man intake, which has the unique ability to be used as a single four-barrel, dual-quad, or six-pack configuration. (Note that the EZ-1 is designed to be used with any Max Wedge X-ram style intake.) For our Indy Mod Man intake, we chose the dual-quad set-up for use with a pair of Edelbrock 500cfm mixers. We were very deliberate in our selection of the low-deck Indy Maxx block and a Mod Man intake as the goal is to get it all to fit under the Valiant’s stock, flat hood. The jury’s still out on that, but one thing we do know is that the 500ci crate motor belted out 657 hp (6,100 rpm) and 662 lb-ft of torque (4,500 rpm) on 92 octane pump gas. That’s the kind of power that will incinerate the rear tires—and it all begins and ends with the right set of cylinder heads!

Source:
Indy Cylinder Head
317-862-3724
www.IndyHeads.com



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