Bill Mitchell Products BMP 020750 – Cylinder Head Aluminum Chevy Big Block 320cc 80cc 16Degree 2.350″ x 1.880″(DISCONTINUED)

BILL MITCHELL PRODUCTS BMP Cylinder Head Aluminum Chevy Big Block 320cc 16Degree 2.350″ x 1.880″

BMP’s 16 Degree Big Block Chevy combines flow characteristics common to expensive race-only Head with exotic splayed valve setups. Designed with 2.350″ and 1.880″ valves, as well as “standard” Mark IV intake systems. This has been accomplished through “rolling” the head to a 16° valve angle, designing highly efficient intake and exhaust ports and using a special 80cc combustion chamber.

These Head require a Shaft Type Rocker Arm set up like JESEL part #KPS325131. You’ll also probably need to get a set of pistons that take advantage of the chamber design, but other than that you can use most of everything from a standard big block Chevy, so when you add up the performance potential versus total cash outlay, it’s clearly the HOT setup for Sportsman racers!

They’re available bare, or in two different assemblies that are designed to match your camshaft’s valve spring requirements. A multi-angle valve job and Manley stainless steel valves make the assemblies an excellent value and a real time-saver for engine builders. For those seeking more power, the BMP BBC aluminum 16 degree Head are available as CNC-ported Head with 98cc combustion chambers and 345cc intake runners.

Available Assemblies are listed in the option section to the right

020750-2 , 020750-3 , 020750-4

TECHNICAL SPECS

• Casting ID Number: WOR-071B 320cc
• Material: 355-T6 alloy high density aluminum
• Valve Seats: Intake (hardened), exhaust (hardened)
• Valve Guides: Manganese bronze
• Valve Size: 2.350 Intake 1.880 Exhaust
• Valve Angle: 16 Degrees
• Valve Seat Angle: 50 Degrees
• Spring Seats: Machined for 1.650″
• Valves: Manley stainless steel valves in assemblies
• Guide Plates: N/A
• Rocker Arm Studs: N/A
• Rocker Arms: Std Rockers, Jesel Part# KPS-325131
• Intake runner : 320cc Standard port location
• Exhaust Ports: 132cc raised .600”
• Combustion Chamber: 80cc CNC Ported
• Spark Plug: 14mm .750″ reach gasket style, Accel 416
• Valve Job: Multi-angle intake and radius exhaust
• Valve Cover Rail: Raised
• Exhaust Gasket: Felpro

BMP 320cc BBC Aluminum Head Flow Data 
Valve Lift — .200 –.300 –.400 –.500 –.600 –.700 –.800 
2.300 ——- 134 — 187 — 245 — 303 — 349 — 379 — 392 
1.880 ——- 107 — 148 — 183 — 214 — 238 — 254 — 265

BMP 345cc BBC Aluminum Head Flow Data CNC PORTED
Valve Lift — .200 –.300 –.400 –.500 –.600 –.700 –.800 
2.300 ——- 143 — 228 — 299 — 349 — 391 — 425 — 451 
1.880 ——- 126 — 177 — 205 — 231 — 255 — 273 — 286
Methods used: Superflow 600, Flowed at 28″ with full CNC porting, 1″ radiused entry plate on the intake port, No exhaust tube, Using Manley Severe Duty valves.

Heads are sold individually.