Bill Mitchell Products BMP 024020C – Cylinder Head Aluminum Chevy Small Block 255cc 64cc 23Degree 2.080″ x 1.600″ CNC PORTED(DISCONTINUED)

BILL MITCHELL PRODUCTS BMP Cylinder Head Aluminum Chevy Small Block 235cc 23Degree Angle Plug 2.080″ x 1.600″ (Currently not in production)

They’re great out of the box in “as cast” form. Originally known as the World Products Motown. With 235cc intake runners they’ll provide ample flow to keep up with the camshaft/intake combinations of most larger displacement small block Chevy engines. For those who desire optimum performance, Bill Mitchell Products offers these Head CNC-ported with 255cc intake runners and enlarged 90cc exhaust ports. The CNC ported Head also use 2.080” Manley stainless steel intake valves, so you can readily see the kind of power these designs will deliver.

They’re available bare, or in three 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.

Available Assemblies are listed in the option section to the right

024020C-2 , 024020C-2 , 024020C-3

TECHNICAL SPECS

• Casting ID Number: WOR-077A
• Material: 355-T6 alloy high density aluminum
• Valve Seats: Intake (hardened), exhaust (hardened)
• Valve Guides: Manganese bronze
• Valve Size: 2.080 Intake 1.600 Exhaust
• Valve Angle: 23 Degrees
• Valve Seat Angle: 45 Degrees
• Spring Seats: Machined for 1.560″
• Valves: Manley stainless steel valves in assemblies
• Guide Plates: BMP 702351
• Rocker Arm Studs: Screw In Style
• Rocker Arms: Std Rockers w/.150 offset Jesel Part# KPS-47402
• Intake runner : 235cc or 255cc Standard port location
• Exhaust Ports: 70cc standard location
• Combustion Chamber: 64cc
• Spark Plug: 14mm .750″ reach gasket style, Accel 416
• Valve Job: Multi-angle intake and radius exhaust
• Valve Cover Rail: Raised, Felpro 1604
• Intake Gasket: Felpro 1206
• Exhaust Gasket: Felpro 1406
  
  

BMP 235cc SBC Aluminum Head Flow Data 
Valve Lift — .200 –.300 –.400 –.500 –.600 –.700 –.800 
2.080 ——- 135 — 198 — 247 — 284 — 296 — 300 — 301 
1.600 ——- 107 — 147 — 174 — 193 — 203 — 211 — 215

BMP 255cc SBC Aluminum Head Flow Data CNC PORTED
Valve Lift — .200 –.300 –.400 –.500 –.600 –.700 –.800 
2.080 ——- 137 — 206 — 262 — 297 — 309 — 319 — 322 
1.600 ——- 123 — 166 — 193 — 211 — 222 — 229 — 232 
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. Flowed By GT Cylinder Head Sophia, NC

Heads are sold individually.