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Mild-Mannered 440 Mauler - Part 4, The Top End Build

INDY EZ HEAD SPECS
  440 EZ 440 EZ-1 EZ-295 CNC EZ 325 CNC
Intake volume 270cc 275cc 295cc 325cc
Exhaust volume     79cc 79cc
Chamber volume 75 or 80cc 75 or 80cc 78 or 82cc 78 or 82cc
Intake window stock B/RB Max Wedge Max Wedge Max Wedge
Porting as-cast partial CNC full CNC full CNC
Rocker oiling standard standard external external
Rocker offset standard standard standard offset
Intake valve dia. 2.19” 2.19” 2.19” 2.19”
Exhaust valve dia. 1.81” 1.81” 1.81” 1.81”

INDY PORT FLOW - Intake
Tested by Indy
28-inch H2O Depression
LIFT 440 EZ 440 EZ-1 EZ-295 CNC EZ 325 CNC
.200 156   162  
.300 216   216  
.400 264   274  
.500 290   324  
.600 300   351  
.700 305   355  

INDY PORT FLOW - Exhaust
Tested by Indy
28-inch H2O Depression
LIFT 440 EZ 440 EZ-1 EZ-295 CNC EZ 325 CNC
.200 98 98 110 110
.300 129 129 149 149
.400 158 158 176 176
.500 178 178 196 196
.600 199 199 211 211
.700 215 215 225 225

440 Top End Bulid Applying Silicone
Before the heads are bolted... 
   
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440 Top End Bulid Applying Silicone
Before the heads are bolted on, a bead of silicone is applied to the valley plate to seal it to the heads. We first trial fit the heads, and marked a line with a felt pen showing where the heads meet the plate.
440 Top End Bulid New Longer Studs
Just before installing the... 
   
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440 Top End Bulid New Longer Studs
Just before installing the cylinder heads, the tops of the copper head gaskets were given a smear of sealant, as needed, and then our monsters from Indy were guided over the studs. We found that four of the head studs from our standard Milodon 440 set, one above each pair of intake ports, were too short with the Indy castings. These were replaced with studs measuring 511/44 inches.
440 Top End Bulid New Longer Pushrods
Indy's EZ heads, with their... 
   
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440 Top End Bulid New Longer Pushrods
Indy's EZ heads, with their raised intake runners and longer valves, require longer pushrods. We measured the length required for our block and valvetrain combo, and ordered a set of 31/48-inch pushrods from Smith Brothers.
440 Top End Bulid Harland Sharp Roller Rockers
Custom high ratio 1.7:1 Harland... 
   
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440 Top End Bulid Harland Sharp Roller Rockers
Custom high ratio 1.7:1 Harland Sharp roller rockers move the valves in a hurry, achieving a serious .600-inch lift from our Comp Cams flat-tappet cam. The valves were adjusted to just a nudge of about one-eighth of a turn past zero lash, giving just a minimum of preload for quiet operation.
440 Top End Bulid Grounded Clearance
We found the intake manifold... 
   
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440 Top End Bulid Grounded Clearance
We found the intake manifold exhaust cross over hit the valley inspection cover fasteners. We ground some clearance, and swapped to a button head fastener to solve that issue. The EZ heads have no provision to run manifold heat, and we'd recommend blocking it if they had.
440 Top End Bulid Sheet Metal Valve Covers
Our buddy Roger Helgesen scored... 
   
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440 Top End Bulid Sheet Metal Valve Covers
Our buddy Roger Helgesen scored these fabricated sheetmetal valve covers at a swap meet, and when we were caught eyeing them at his shop, he said we could have them. We have no idea who made them, but some of the welds look questionable, so we're not sure they'll stay on the engine, but a trial fit was encouraging, and they did look good. Breathers will have to be installed before we run the engine.
440 Top End Bulid Access Cover
Twelve bolts secure the access... 
   
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440 Top End Bulid Access Cover
Twelve bolts secure the access cover in the Indy valley plate. A bead of silicone provides the seal, though Indy offers a gasket (PN 228).
440 Top End Bulid Intake Manifold
The Indy 440-2D RB intake... 
   
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440 Top End Bulid Intake Manifold
The Indy 440-2D RB intake manifold is by far the highest flowing two-plane we've ever tested. The large ports are easily matched to the EZ 295's port size. The two-plane configuration should be worth torque, and improve idle quality and vacuum slightly, but we hope to also try an Indy 440-2 RB 4150-series single-plane manifold.
440 Top End Bulid External Oiling
Both of the larger CNC EZ... 
   
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440 Top End Bulid External Oiling
Both of the larger CNC EZ heads required external oiling. We were surprised to hear from Russ Flagle, who along with his brother Fred, founded Indy Cylinder Head, that some customers are apprehensive about this additional mod. Plumbing it up takes a couple of minutes, thanks to Indy's well thought out kit (PN 440-10), and the convenient oil gallery at the rear of a Mopar big-block. The procedure is about as tricky as hooking up your garden hose.
Tech Line Coating
Murrieta
CA
(951) 304-0498

www.techlinecoatings.com
Indy Cylinder Heads
Indianapolis
IN
(317) 862-3724

www.indyheads.com
Smith Brother Pushrods
Bend
OR
800/367-1533

pushrods.net
Competition Cams
Memphis
TN
800/999-0853

compcams.com
Milodon
Simi Valley
Ca
805/577-5950

milodon.com
Barry Grant/ Demon Carburetion
Dahlonega
GA
(706) 864-8544

www.barrygrant.com

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