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Bill Mitchell Products SBC 23° 255cc CNC Aluminum Heads

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  • Bill Mitchell Products SBC 23° 255cc CNC Aluminum Heads
  • Bill Mitchell Products SBC 23° Aluminum Heads
  • Bill Mitchell Products SBC 23° Aluminum Heads
  • Bill Mitchell Products SBC 23° Aluminum Heads
  • Bill Mitchell Products SBC 23° Aluminum Heads
  • Bill Mitchell Products SBC 23° Aluminum Heads
  • Bill Mitchell Products SBC 23° Aluminum Heads
  • Bill Mitchell Products SBC 23° 255cc CNC Aluminum Heads
  • Bill Mitchell Products SBC 23° 255cc CNC Aluminum Heads
Bill Mitchell Products (BMP)
$1,187.04
Condition:
New
Availability:
ALL BMP CYLINDER HEADS ARE PRICED INDIVIDUALLY

 Product Description

They’re great out of the box in “as cast” form and even better CNC'd! Originaly known as the World Products Motown. With 255cc 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 heads CNC-ported with 255cc intake   runners and enlarged 90cc exhaust ports. The CNC ported heads also use 2.080” Manley stainless steel intake valves, so you can readily see the kind of power these designs will deliver. These are the very same heads World uses on their Small Block Chevy   Engines.

They’re available bare, or in four 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. World Products has built over 10,000 Engines using our Dyno proven Cylinder heads. Over 10,000 Dyno pulls have given us the results you are looking for. From 450HP Street Engines to 850HP Drag Engines, we have the Experience and Dyno tests to prove what Horsepower our heads can produce. No other company has done the amount of hands-on research & development as Bill Mitchell Products and no other company can back their Horsepower claims as BMP can. Your results may vary depending on your Engine build. BMP gives you Hardcore Quality & Performance!

ALL BMP CYLINDER HEADS ARE PRICED INDIVIDUALLY

TECHNICAL SPECS 

  • Casting ID Number: WOR-077A 
  • Material: 355-T6 alloy high density aluminum  
  • Valve Seats: Intake (hardened), exhaust (hardened)
  • Valve Guides: Manganese bronze Spring Seats: Machined for 1.560" 
  • Valves: Manley stainless steel valves in assemblies
  • Valve Diameter: 2.080" intake, 1.600" exhaust (11/32" stem) as cast,
  • Valve Diameter CNC ported: 2.080" intake, 1.600" exhaust (11/32" stem)
  • Guide Plates: Stock (Special guide plates required for 235cc head, part #702351-8) R
  • ocker Arm Studs: Screw-in style Rocker Arms: .150 offset ratio (use of 1.6 ratio may require elongation of pushrod holes)
  • Rocker Arms: Jesel Part# KPS-47402
  • Intake Runner: 235cc, 255cc for CNC'd heads, both with standard port location
  • Exhaust Ports: 70cc standard location
  • Combustion Chamber: 64cc, angled plug orientation
  • Spark Plug: 14mm .750" reach gasket style. Accel 416 or equivalent
  • Valve Job: Multi-angle intake and radiused exhaust
  • Valve Cover Rail: Raised w/ both perimeter and center bolt patterns
  • Valve Angle: Stock 23°
  • Accessory Bolt Holes: Stock

 

024020 BMP 235cc Aluminum Head Flow Data
Valve Lift--.300 --.400 --.500 --.600 --.700 --.800
2.080 ----   198  - 247  -  284 -- 296  -  300  - 301
1.600 ----   147  - 174  -  193 -- 203  -  211  - 215
Methods used: Superflow 600, Flowed at 28" with a bowl blend 1" down, 1" radiused entry plate on the intake port, No exhaust tube, Using Manley RaceMaster valves.

 

024020C BMP 255cc CNC Aluminum Head Flow Data
Valve Lift--.300 --.400 --.500 --.600 --.700 --.800
2.080 ----   206  -  262  - 297 -- 309 -- 319 -- 322
1.600 ----   166  -  193  - 211 -- 222 -- 229 -- 232
Methods used: Superflow 600, Flowed at 28" with CNC porting, 1" radiused entry plate on the intake port, No exhaust tube, Using Manley RaceMaster valves.

 

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