Indy Cylinder Head/Milodon-Buildup - Mopar Muscle Magazine

In a world where technology has brought us overhead cams, veritable cam timing, high-powered, small-inch, "efficient" engines, factory offerings with over 10:1 compression made to run on pump fuel, and a whole slew of other titillating innovations, it's nice to see that cubic inches are still the way to make big power and huge torque. But what if you equipped your big-inch monster with one modern concession? What would it be? How about a 542ci, pump-gas swilling, aluminum-headed, asphalt buckler with fuel injection? Imagine no cold-start issues and unparalleled drivability. Now imagine 665 lb-ft of torque at a mere 4,500 rpm and 624 eager horses at a low 5,100 rpm! The kicker? All that is available on 87-octane pump dribble.

This Indy Cylinder Head/Milodon-built wonder is the perfect recipe for a modern street engine. With enough torque to turn the Earth on its axis, the convenience of fuel injection, and the ability to run all-day-long on the worst possible gas, we would say that Indy scored a home run, a field goal, and a knockout. All we know is that this is the wave of the future with enough oats to push even a cruise liner into the 10s.

Engine Specs

• MP wedge Siamese mega-block
• 4.380 bore/4.500 stroke block lightened, but motor mounts left on
• Crower 4340 crank - 4.500 stroke - 2.375 rod journal
• Clevite main bearings MS1795V std
• Clevite rod bearings CB 527HD std
• Crower 4340 rods 7.00 center to center - with .990 wrist pin
• Ross forged pistons 4.380 bore - 1.460 compression height - 40cc dish
• Speed pro rings R9278+65 1/16 1/16 3/16 top gap .022 bottom .028
• Comp Cams hydraulic cam CRB 5965-5985 H-112
• .546/.546 - 241/247 - 112 degree LSA - installed at 108
• Comp Cams 822-16 lifters
• Milodon true roller chain set
• Milodon complete engine bolt kit
• MP chrome timing cover
• Indy 440/SR aluminum wedge heads CNC-ported 295cc intake runner 2.19/1.81 stainless valves intake flow 355 CFM exhaust flow 266 CFMcombustion chamber 75 cc
• Comp 924-16 valvesprings, 10-degree locks, chrome moly retainers, Teflon seals
• 9.5:1 compression ratio
• Indy 440-4S/R roller rockers 1.5 ratio
• Indy 440-14 rocker shafts, 440-11 clamp studs, 440-5c billet hold downs
• Indy 440-17 head studs, 440-9 3/8 chromoly pushrods 9.500 long
• Indy 440-7 Logo valve covers with breathers and baffles installed
• Felpro 1009 head gaskets, Indy #216 intake gaskets
• Milodon 30930 oil pan
• Milodon big-stroke windage tray
• Milodon static pickup
• Milodon high-volume oil pump with aluminum pump cover for spin on filter
• MSD pro series plug wires
• Indy 440-30 EFI ready intake manifold with rails mounted
• Accel/DFI Gen V11 fuel injection with 1000 CFM air valve and dual sync distributor

Dyno Results

EngSpdSTP TrqSTP Pwrrpmlb-fthp3,000606.4346.43,100610.2360.23,200608.6370.83,300605.7380.63,400608.6394.03,500613.1408.53,600626.4429.43,700627.6442.13,800631.1456.63,900650.2482.84,000653.2497.54,100655.6511.84,200657.6525.94,300662.5542.44,400664.8556.94,500665.0569.84,600661.8579.64,700653.6584.94,800654.6598.24,900662.6618.25,000651.3620.05,100643.6624.95,200627.4621.15,300612.5618.15,400592.0608.7