Bill Mitchell Products BMP 085500 – Aluminum Engine Block Chevy Big Block 9.800 Deck, 4.240 Bore, Billet Caps

Bill Mitchell Products BBC 357T6 Aluminum Engine Block Chevy Big Block 454 Mains, 9.800″Deck, 4.240″ Bore. Standard Cam(includes, Screw in Freeze plugs, Cam plug, All dowel pins and Pipe plugs) 085500

Block Specifications:

Block Applications: The BMP Aluminum BBC blocks are designed to be a replacement for all OEM bbc blocks
Casting Number: BMP-016
Block Material: 357-T6 aluminum alloy.
Block Weights: BMP BBC Aluminum blocks with main caps, hardware and cylinder sleeves 130lbs
Deck Height: 9.800” or 10.200” (depending on part number)

Deck Thickness: .600” minimum

Cam Bearings: Accepts Standard Big Block Chevy Cam bearings. Can be machined for a 55mm bearing

Main Bearings: Utilizes Big Block Chevrolet style main bearings.

Main Caps: Billet steel, Center three caps have splayed studs. The front and rear caps are a straight
studded design. All the main caps use a ½” thread. Torque spec on main bolts both inner and outer is 95-100 ft. lbs. with oil. ARP Stud Kit BMP# 701420.2
Rear Main Seal: Standard Big Block Chevy two-piece rear main seal, Fel Pro # P29182 is used

Lifter Bores: Indexed. (Lifter bore size is standard Chevy diameter .8437) Lifter valley is drilled and tapped (5/16 fine thread) to accept a lifter valley
windage tray.

Cylinder Bores: 4.240” or 4.490”. ±.005” Cylinder bores are of a Siamese design. Sleeves are a replaceable, centrifugal cast ductile steel pressed in
with a .001” to .002” fit. Block is machined to incorporate an o-ring behind the sleeve to keep oil from traveling up between the sleeve and the block.
Sleeves do not protrude into the water and are considered a dry sleeve.
NOTE: It is very important that you draw down each and every sleeve to assure that it is seated prior to decking the block. Beating with a big
hammer and a block of wood is not acceptable due to the chance of sleeve bounce.

Cylinder Bore Centers: Stock 4.840”.
Cylinder Wall Thickness: Sleeve OD on all BBC blocks 4.685”+ approximately .200” aluminum surrounding the sleeve (except between the
cylinders of course). These blocks can be safely bored to 4.560” but the engine builder must make the final decision based on the application being built
for. Keep in mind that sleeve thickness is not so important as is the aluminum left between the bores.
Freeze Plugs: All aluminum blocks include screw in freeze plugs. Torque to 35 ft lbs with anti seize on threads and o-rings
Distributors: When using a 10.200 deck height block, a distributor designed for a “Tall Deck” must be used unless using a manifold already cut.

Oil System Features: Priority main oiling. As is, block is set up for OE style internal oil pump. Block may be converted to a dry sump oiling system.

Stroke Clearance: 9.800” deck height can handle up to a 4.375” inch stroke without block relieving. Blocks with a 10.200” deck height can handle up
to a 4.750” inch stroke (with steel or titanium connecting rods and a stock base circle cam) with minor clearancing. Sleeves are left long due to varying
needs of engine builders.

Water Jackets: Expanded for better cooling. O-ringed freeze plugs, screw-in style, BMP part # 701645. (supplied with all new blocks)

Oil Restrictors: Blocks use oil restrictor part # 701802-2.

Filtration: Integral mount for spin on filter. The oil filter mounting boss has been relocated to clear kickout style oil pans.

Oil Pan Rails: Solid (stock width) can be clearanced for strokers. Oil pan rail is dual drilled for stock oil pans and aftermarket race oil pans.
Cylinder Head Bolt Holes: Head bolt holes are blind tapped and do not extend into the water jackets. BMP blocks incorporate an extra two head bolt
bosses per side in the lifter valley area. This allows certain race heads that have 18 to 20 head bolts to be installed on the block without modification.
SPECIAL NOTE: THE TORQUE VALUE USED ON THE FASTENERS FOR THESE BOSSES IS NOT TO EXCEED 35 LB.FT. DO NOT IGNORE THIS
SPECIFICATION. Standard Big Block heads with 16 head bolts can be used by not employing the extra 4 head bolt bosses.
IT IS THE BUILDER’S RESPONSIBILITY TO DETERMINE THAT BOLTS OR STUDS USED HAVE THE PROPER ENGAGEMENT TO PREVENT
STRIPPING THE THREADS.

Camshaft: Is in the stock location.

Fuel Pump: Uses stock style fuel pump and stock length fuel pump pushrod. When using a billet aluminum fuel pump block off plate you may
need to modify it slightly for fit due to overall size.

Starter: Starter mounting pad is drilled for both straight across and stagger bolt patterns.

Bell Housing Pattern: Stock GM
Motor Mounts: Drilled and tapped for side and front mounts in OEM locations.

Gear Drives & Belt Drives: To prevent contact between oil galley plugs and belt drive or gear drive covers, it may be necessary to tap the oil galley
holes in the block deeper so the oil galley plugs will sit flush with the block, or you can use shorter plugs.

Water Pump: Stock BBC