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Everything you need to know about the KEITH BLACK® HEMI and RB/WEDGE based engine blocks

Designed to endure the punishment of Top Fuel power levels, and enhanced without compromise for everyday use






BLOCK OPTIONS


* USD MSRP ex Dealer. Excludes shipping, handling and any applicable and country or jurisdictional specific taxes.

All KB® HEMI, RB/WEDGE, or PRO blocks whether in STREET, RACE or SEMI-FINISHED configuration start life from the same high-quality A356 aluminum T6 heat treated low-pressure aerospace casting

  • The KB® STREET and RACE HEMI engine blocks are a direct replacement for the Chrysler GEN II 426 HEMI (1964-1971) engine block
  • Low- Pressure Cast A356 T6 precision machined aluminum engine block
  • Made in the USA
  • High-flow water-jacketed dry-liner siamese-bore construction for maximum strength and cooling
  • Darton® sleeves 4.494 in. diameter semi-finished and installed (4.244 optional)
  • 4340 Steel main bearing caps semi-finished to OEM RB Mopar® crankshaft dimensions
  • ARP® 5/8 UNC-9/16 UNF KB® proprietary main studs and ARP® 1/2 in. double cross bolts (caps 2, 3, 4) for maximum clamp load
  • Formed internal threads, blind-tapped to C3B specification for use with bottoming studs to ensure maximum service life and maximum clamp load
  • Machined for ARP® 1/2 in. head studs (7/16 in. optional)
  • All engine blocks have an advanced oil system design providing builders with multiple options for oil-control fine-tuning; oiling lifters, valvetrain and for external direct-oil-supply systems such as dry-sump and accumulator setups. All engine blocks come with full lifter-oiling
  • OEM Camshaft Location
  • OEM Cam Journal Diameter
  • OEM Lifter Spacing 1.800 in.
  • OEM Lifter Bore Dia. 0.905 in.
  • OEM Lifter Angle 45°
  • OEM Deck Height 10.725 in.
P/N DESCRIPTION

51100.4500S

HEMI Street STD Deck Height 4.500 Bore 1/2 in. Head Studs

51100.4500S716

HEMI Street STD Deck Height 4.500 Bore Machined for 7/16 in. Head Studs

51100.4250S

HEMI Street STD Deck Height 4.250 Bore Machined for 1/2 in. Head Studs

51100.4250S716

HEMI Street STD Deck Height 4.250 Bore Machined for 7/16 in. Head Studs

  • Raised Camshaft Location +0.250 in
  • Machined for 60 mm roller cam bearing (65 mm babbitt cam bearing)
  • 2.000 in. Lifter Spacing
  • OEM Lifter Bore Dia. 0.905 in.
  • 48° Lifter Angle
  • OEM Deck Height 10.725 in (11.225 Tall Deck Available)
  • Solid Block option is available (no water jackets)
P/N DESCRIPTION

51100.4500R

HEMI Race STD Deck Height 4.500 Bore 1/2 in. Head Studs

51100.4250R

HEMI Race STD Deck Height 4.250 Bore 1/2 in. Head Studs

51100.4500RT

HEMI Race +.500 Deck Height 11.225 4.500 Bore 1/2 in. Head Studs

51100.4500RT-S

HEMI Race +.500 Deck Height 11.225 4.500 Bore 1/2 in. Head Studs SOLID Block

  • The KB® STREET and RACE RB/WEDGE engine blocks are direct replacements for the Chrysler 440 RB (1959-1979) engine block
  • Low- Pressure Cast A356 T6 precision machined aluminum engine block
  • Made in the USA
  • High-flow water-jacketed dry-liner siamese-bore construction for maximum strength and cooling
  • Darton® sleeves 4.494 in. diameter semi-finished and installed (4.244 optional)
  • 4340 Steel main bearing caps semi-finished to OEM RB Mopar® crankshaft dimensions
  • ARP® 5/8 UNC-9/16 UNF KB® proprietary main studs and ARP® 1/2 in. double cross bolts (caps 2, 3, 4) for maximum clamp load
  • Formed internal threads, blind-tapped to C3B specification for use with bottoming studs to ensure maximum service life and maximum clamp load
  • Machined for ARP® 7/16 in. head studs
  • All engine blocks have an advanced oil system design providing builders with multiple options for oil-control fine-tuning; oiling lifters, valvetrain and for external direct-oil-supply systems such as dry-sump and accumulator setups. All engine blocks come with full lifter-oiling
  • OEM Camshaft Location
  • OEM Cam Journal Diameter
  • OEM Lifter Spacing 1.800 in.
  • OEM Lifter Bore Dia. 0.905 in.
  • OEM Lifter Angle 45°
  • OEM Deck Height 10.725 in.
P/N DESCRIPTION

44000.4500S

RB/WEDGE Street STD Deck Height 4.500 Bore

44000.4250S

RB/WEDGE Street STD Deck Height 4.500 Bore

  • Raised Camshaft Location +0.250 in
  • Machined for 55 mm roller cam bearing (60 mm babbitt cam bearing)
  • 1.800 in. OEM Lifter Spacing
  • OEM Lifter Bore Dia. 0.905 in.
  • OEM 45° Lifter Angle
  • OEM Deck Height 10.725 in (11.225 Tall Deck Available)
P/N DESCRIPTION

44000.4500R

RB/WEDGE Street STD Deck Height 4.500 Bore

44000.4250R

RB/WEDGE Street STD Deck Height 4.250 Bore

44000.4500RT

RB/WEDGE Race +0.500 in Raised Deck Height (11.225 in.) 4.500 Bore

  • A direct replacement for the Chrysler GEN II 426 HEMI (1964-1971) OR Chrysler 440 RB (1959-1979) engine blocks (partly machined)
  • Low- Pressure Cast A356 T6 precision machined aluminum engine block*
  • Made in the USA
  • High-flow water-jacketed dry-liner siamese-bore construction for maximum strength and cooling
  • Solid Block option available (no water jackets)
  • 4340 Steel main bearing caps semi-finished to GEN II OEM RB/WEDGE and HEMI crankshaft dimensions
  • ARP® 5/8 UNC-9/16 UNF KB® proprietary main studs and ARP® 1/2 in. double cross bolts (caps 2, 3, 4) for maximum clamp load
  • Formed internal threads for main caps, blind-tapped to C3B specification for use with bottoming studs to ensure maximum service life and maximum clamp load
  • All engine blocks have an advanced oil system design providing builders with multiple options for oil-control fine-tuning; oiling lifters, valvetrain and for external direct-oil-supply systems such as dry-sump and accumulator setups. All engine blocks come with full lifter-oiling
  • Final Deck Height: PRO engine blocks are semi finished to 11.230 in. with cylinder head locating dowel-pin holes machined into correct position for use as datums.
  • Head Stud holes and internal threads: PRO engine blocks have no cylinder head fastener holes machined. Machine for HEMI or RB/WEDGE, or alternatives like Predator or B1 heads.
  • Lifters: Builder and machinist must machine-finish lifter bores, this allows for builder to choose their own camshaft design, lifter spacing, lifter-angle, lifter diameter, and lifter-bushing choice.
  • Cylinder Head and Valvetrain specific machining: Blocks must be machined to provide for water jacket and cylinder head cooling (if any), oil-returns, pushrod operating clearances, and valvetrain through-deck oil supply.
  • Camshaft Choice: PRO engine blocks are machine finished for a +0.250 in. raised cam location 60mm (babbitt) / 55mm (roller) bearing camshaft. This can be machined to 65mm (babbitt) / 60mm roller bearing camshaft.
  • Sleeves: PRO engine blocks come without sleeves, depending on the final deck height choice of the builder and machinist, an upper-bore sleeve-register will need to be machined on the final deck height. Contact your Dealer for more information
P/N DESCRIPTION

51100.4500PRO

PRO Semi-finished (WATER JACKETED BLOCK)

51100.4500PRO-S

PRO Semi-finished (SOLID BLOCK)

 

Keith Black Racing Engines® is a registered trademark of Keith Black, Inc. All engine blocks are sold exclusively through the Keith Black Racing Engines® Dealer Network by Authorised Dealers. Keith Black Racing Engines® does not sell engine blocks direct to consumers or engine builders outside its Dealer Network. Standard Terms and Conditions of Sale, and Limited Warranty apply to this product. Keith Black Racing Engines® Engine block products are not legal for sale or use in California on any pollution controlled motor vehicles. warning-triangleWARNING This product contains chemicals known to the State of California to cause cancer and reproductive harm www.P65Warnings.ca.gov 



WHY CHOOSE KEITH BLACK®?


Since its debut in 1973, the Keith Black aluminum 426 Hemi engine has been responsible for more record-setting performances on land and in the water than any other specialty engine. The Keith Black Hemi held every national record in Top Fuel between 1974 and 1984. Milestones achieved by this power plant include Don Garlits’ shattering of drag racing’s 250 mph barrier, Don Prudhomme’s first ever 5-second Funny Car clocking, and Shirley Muldowney’s three World Championships (and numerous other records).

There are many reasons for the tremendous success enjoyed by this engine. But, perhaps the most important of these reasons is the fact that the Keith Black aluminum Hemi, now in its 48th year, is the product of a never-ending development program. Now manufactured using the highest quality materials and manufacturing processes, while remaining true to the founding values of Keith Black Racing Engines – extended service-life, availability of compatible parts and dependability. Read about what sets the Keith Black Hemi apart from other Hemi engine blocks, and learn more about this legendary engine.

Keith Black Racing Engines® Hemi. Feared and respected since 1973. Engine Blocks for Extreme Horsepower™.

MODERN PRECISION CASTING

  • Legendary design proven in the field time and again, often in applications making 6,000+ hp or more
  • The only block that is low-pressure cast. Low-pressure casting creates a superior microstructure leading to improved mechanical and thermodynamic properties, higher densification and superior grain structure
  • A356-T6 is the best overall performing aluminum, it has the best properties for managing heat transfer and load, with 300% greater thermal conductivity than cast iron
  • Not only lighter, but runs cooler
  • Bolts into any A, B, or E body classic Mopar®

TOUGHEST BOTTOM-END IN THE BUSINESS

  • 4340 Billet Steel Main Caps
  • Proven at over 4,500 lb-ft of torque with zero fastener deflection
  • Highest cap-to-block contact area of all aftermarket blocks. Maintains dimensional and mechanical stability across all operating conditions, while eliminating oil pressure loss common with other blocks
  • 5/8 in. rolled internal C3B class threads that will not pull under extreme loads
  • Proprietary ARP® and KB® designed 5/8-9/16 in. main studs supported with 4 x 1/2 in. double cross-bolts on main caps 2, 3 and 4 for massive clamp load

EASILY HOLDS MASSIVE CYLINDER PRESSURE

  • Ultra-thick deck surfaces and deep thread engagement reduces upper cylinder distortion and enhances ring seal while supporting high clamp-loads
  • C3B specification internally rolled blind threaded head stud threads for long service life. No more pulled threads
  • The only aftermarket block where the head studs are designed specifically to work with aluminum. All other blocks use OEM spec hardware designed for stock cast-iron applications
  • The only aftermarket block to use Darton® and KB® proprietary specification centrifugally-cast ductile-iron sleeves to contain extreme cylinder pressures while providing exceptional thermal management
  • Darton® sleeves have increased wear resistance, a longer service life and make more power
  • Rigid block design

MODERN CAMSHAFT OPTIONS

Significant casting material added to support the use of modern, large diameter camshaft cores

All STREET blocks support OEM journal diameter camshaft journals in the OEM location

All RACE blocks have a +0.250 in raised cam location providing additional rotating assembly clearance for larger stroke applications, and improved valvetrain geometry

KB® STREET HEMI blocks are machined for 65/60mm camshaft journal diameter (babbitt/roller bearing)

KB® RACE RB/WEDGE blocks are machined for 60/55mm camshaft journal diameter (babbitt/roller bearing)

ADVANCED OIL SYSTEM DESIGN

  • Comes standard with multiple options for the builder to configure oil supply: You have 100% control over your oiling system setup
  • Eliminate oil starvation with the largest diameter cylinder head oil-return drain-backs
  • Provisions for external oiling in dry sump applications or for use with oil accumulators
  • Full time oil supply to the valvetrain



PURCHASE A BLOCK


ALL Keith Black® Chrysler HEMI and WEDGE based engine blocks are sold exclusively through the Keith Black® Authorized Dealer Network.

Our Authorized Dealer Network comprises a small number of professional racing-engine building shops. They represent the most experienced, relevant and respected Chrysler HEMI and 440 engine builders around. Having, without exception a long history in building class-winning and record setting Chrysler HEMI and 440 engines.

We chose to partner with these outstanding people and businesses to ensure you will receive the very best advice and support from hands-on people that build Chrysler HEMI and 440 based engines every day.