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2009 Engine Masters Challenge 690 Horsepower Mopar Engine

SKMFX 471ci Mopar Big Block - Black Ops Commando

BY THE NUMBERS
SKMFX ENGINES 471 MOPAR
Bore: 4.375 inches
Stroke: 3.915 inches
Displacement: 471 actual cubic inches
Compression ratio: 11.4:1
Camshaft: COMP Cams solid roller
Cam duration: 269/269 degrees at .050-inch
Valve lift: .752-/.708-inch
Rocker ratio: T&D Shaft 1.6/1.5 ratio
Top ring: 1/16-inch, Mahle/Clevite
Second ring: 1/16-inch, ductile iron
Oil ring: 3/16-inch, low tension
Piston: KB Pistons, flat top
Block: OEM 400 B-block
Crankshaft: 440 Source
Rods: Scat 6.385-inch BBC
Cylinder head: Edelbrock Victor
Intake valve diameter: 2.25-inch
Exhaust valve diameter: 1.81-inch
Intake manifold: Weiand tunnel ram
Carburetor: two Holley HP 1000 carbs
Header: Hooker B/E body with 2-inch primaries
Ignition: MSD 7AL2

2009 Engine Masters Challenge Arp Main Studs
A set of ARP main studs clamped... 
   
  read full caption
2009 Engine Masters Challenge Arp Main Studs
A set of ARP main studs clamped the 440Source main girdle in place. Unlike its cross-bolted main brother-the Hemi-regular B-blocks can really benefit from the strength of the steel girdle joining the cast architecture together and diffusing stresses.
2009 Engine Masters Challenge Cylinder Bores
Clearancing the block for... 
   
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2009 Engine Masters Challenge Cylinder Bores
Clearancing the block for the added stroke turned out to be unnecessary, but while they had the grinder handy, they made sure to deburr the bottoms of the cylinder bores as they commonly have sharp edges that can tear up a stroker piston.
2009 Engine Masters Challenge Comp Soild Roller Lifters
COMP solid roller lifters... 
   
  read full caption
2009 Engine Masters Challenge Comp Soild Roller Lifters
COMP solid roller lifters were chosen for their strength and reliability. The SKMFX team was careful to make sure that the oil-shedding Glyptal didn't foul the lifter bores while applying it.
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