Bill Mitchell Products BMP 020660C – Cylinder Head Aluminum Chevy Big Block 375cc 119cc 24Degree 2.300″ x 1.880″ CNC PORTED

BILL MITCHELL PRODUCTS BMP Cylinder Head Aluminum Chevy Big Block 350cc 24Degree 2.300″ x 1.880″  (Currently not in production) 

This highly evolved, race-proven cylinder head is capable of supporting in excess of 800 horsepower in “as cast” form. Formally known as the Merlin III, BMP BBC aluminum Head are available with 310cc or 350cc intake runners.

The BMP BBC Aluminum Head are available with CNC-ported for increased horsepower levels. The ports were designed and developed  with countless hours on not just the flow bench but on the dyno as well. The net result is a head that combines excellent flow and velocity and has been proven to produce 40 horsepower more than the as-cast versions

They’re available bare, or assembled that are designed to match your camshaft’s valve spring requirements. A multi-angle valve job and Manley stainless steel valves make the assemblies

Available Assemblies are listed in the option section to the right

020660C-2 , 020660C-3 , 020660C-4

TECHNICAL SPECS

• Casting ID Number: WOR-070B 350cc
• Material: 355-T6 alloy high density aluminum
• Valve Seats: Intake (hardened), exhaust (hardened)
• Valve Guides: Manganese bronze
• Valve Size: 2.300 Intake 1.880 Exhaust
• Valve Angle: 24 Degrees
• Valve Seat Angle: 45 Degrees
• Spring Seats: Machined for 1.560″ (can be machined to 1.650”)
• Valves: Manley stainless steel valves in assemblies
• Guide Plates: BMP 702355-8
• Rocker Arm Studs: Screw In Style
• Rocker Arms: Std Rockers, Jesel Part# KPS-472150
• Intake runner : 350cc Standard port location
• Exhaust Ports: 132cc raised .600”
• Combustion Chamber: 119cc CNC Ported (all)
• 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 350cc BBC Aluminum Head Flow Data 
Valve Lift — .200 –.300 –.400 –.500 –.600 –.700 –.800 
2.300 ——- 153 — 221 — 284 — 331 — 369 — 399 — 414 
1.880 ——- 108 — 151 — 184 — 217 — 245 — 267 — 284

BMP 375cc BBC Aluminum Head Flow Data CNC PORTED
Valve Lift — .200 –.300 –.400 –.500 –.600 –.700 –.800 
2.300 ——- 156 — 228 — 295 — 340 — 388 — 419 — 432 
1.880 ——- 120 — 156 — 200 — 242 — 269 — 295 — 313
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.