Bill Mitchell Products 085501 Aluminum Big Block Chevy Engine Block 4.500 Bore

The highly refined Bill Mitchell Products BMP BBC aluminum block we have incorporated a significant number of key technical features that set it apart from the competition. And because it’s been designed specifically for the drag race market and keeping the marine and street guys in mind. This and the price of the BMP Big Block Chevy makes this the only choice for your ride. Dollar for dollar, you won’t find a better value in big block Chevrolet technology. It’s manufactured to QS-9000 quality control standards.

One easy to spot difference between the BMP BBC and others is the use of horizontal ribs. Not only do they look cool, but they also serve to improve engine cooling and reinforce the cylinder bores.
Total bottom end dependability is achieved through the use of 1045 alloy steel billet splayed 4-bolt mains (much stronger than commonly used 1020 steel) with genuine ARP main studs.
The BMP BBC Aluminum Block is compatible with all GM Gen IV components (cam location is standard) and is the best foundation for building a large displacement big block Chevrolet with total reliability. Factor in pricing that’s more than competitive, and you’ve got a winner! Formerly known as the World Products Merlin III Aluminum Block.

MATERIAL: 357-T6 aluminum (strongest available)
DECK HEIGHT: 9.800”
DECK THICKNESS: .600" minimum
CAM BEARINGS: Standard Chevrolet big block set
MAIN BEARINGS: Standard Chevrolet
CYLINDER BORE SPACING: 4.840" (stock)
CAMSHAFT LOCATION: Stock
LIFTER BORES: Indexed (stock .843" bore)
LIFTER ANGLES: Int.45°/Ex.39°
BORE: 4.240", 4.490"
MAXIMUM RECOMMENDED BORE: 4.560"
CYLINDER WALL THICKNESS: (.093" @ 4.500" bore, .0625" @4.560" bore)
WATER JACKETS: Expanded for better cooling
LUBRICATION: Priority main oiling system
OIL SYSTEM FEATURES: As is, block is set up for OE style internal oil pump. Block may be converted to a dry sump oiling system.
FILTRATION: Integral mount for spin-on filter
OIL PAN RAILS: Solid (stock width)
CRANK CLEARANCE: 4.750" stroke crank (10.2) 4.375” stroke (9.8)
(both using H-beam steel rods - sleeves only require notching for a 4.750" stroke)
MAIN CAPS: 4-bolt Splayed Billet 1045 Steel
MAIN CAP DESIGN: All 5 Caps are 4 Bolt Design w/ center 3 splayed outer bolts
MAIN CAP LOCATORS: Stock Register & Ring Dowels at the center studs
MAIN CAP HARDWARE: ARP ½” Stud Kit
MOUNTS: OEM starter and oil filter mounts
BLOCK: Side ribs for extra strength & cooling - cross-ribs in valley
MOTOR MOUNTS: Dual (front and side)
CYLINDER HEAD HOLES: Blind tapped to prevent leaks
WEIGHT: Approximately 140 lbs. with sleeves
Cam Bearings: Durabond CHP12
Oil Restrictors: BMP 701802-2
Inner Lifter Valley Extra Head Bolts BMP 701302
Dowel and Plug Kit: BMP 703892S-K
Rear Seal: FEL2904