BILL MITCHELL PRODUCTS BMP Cylinder Head

Aluminum Chevy LS-7 Series 285cc 12Degree 2.250″ x 1.625″ (Currently not in production)

For maximum performance from an LS-series engine, BMP’s LS Aluminum 12 Degree Head is the answer. Using a superior port design featuring 285cc intake & 106cc exhaust runners, these heads deliver incredible flow numbers.

If even more flow is desired, BMP offers a CNC-Ported version that boasts 296cc intake & 110cc exhaust runners. They are dyno-proven to crank out the power!

An important feature of the BMP 12 Degree head is that it comes with TWO EXTRA BOLT HOLES per cylinder (same as BMP LS Blocks) to provide extra sealing for power-adder-boosted high-combustion pressure applications.

Available Assemblies

• 025350-2
• 025350-3
• 025350-4

Technical Specifications

• Casting ID Number: WOR-076
• Material: 355-T6 alloy high-density aluminum
• Valve Seats: Intake (hardened), Exhaust (hardened)
• Valve Guides: Manganese bronze
• Valve Size: 2.250" Intake, 1.625" Exhaust
• Valve Angle: 12 Degrees
• Valve Seat Angle: 50 Degrees
• Spring Seats: Machined for 1.560″ (can be machined to 1.650″)
• Valves: Manley stainless steel valves in assemblies
• Guide Plates: N/A
• Rocker Arm Studs: N/A
• Rocker Arms: Jesel # KPS499187, T&D # 2351
• Intake Runner: 285cc or 296cc Standard port location
• Exhaust Ports: 106cc or 112cc, Standard location
• Combustion Chamber: 64cc
• Spark Plug: 14mm .708″ reach taper style, Accel P526S
• Valve Job: Multi-angle intake and radius exhaust
• Valve Cover Rail: Raised
• Exhaust Gasket: Felpro 1440

Flow Data

* Flow tested using Superflow 600 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.