Brodix BB-3 XTRA 327 Series 24 Degree Assembled Aluminum Cylinder Head [Big Block Chevy]
158-2031031
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Items You Need
BB-3 XTRA 327 Series Cylinder Heads
Cylinder Head Specifications
- Material: A-356 Virgin Aluminum
- Intake Port Volume: 327 cc - Rectangle Port
- Combustion Chamber Volume: 119 cc
- Valve Angle: 24 and 4 Degree Intake, 15 and 4 Degree Exhaust
- Valve Sizes: 2.300 in. Intake / 1.880 in. Exhaust (11/32 in. Stem Diameter)
- Valve Springs: 1.550 in. Diameter; 240 lbs. Seat Pressure
- Steel Valve Retainers
- Raised Valve Cover Rail
- Spark Plug Configuration: Angled
- Drilled Accessory Bolt Holes
Facts and Related Components
- Torque Heads: 70 ft-lb.
- Torque Rocker Studs: 40-45 ft-lb.
- Intake Gasket: Brodix 158-MG2001, Fel-Pro 375-1252-3
- Head Gasket
- 4.540 in. Bore - Fel-Pro 375-1017, Cometic 245-C5433
- 4.600 in. Bore - Fel-Pro 375-1057, Cometic 245-C5434
- Exhaust Gasket: Fel-Pro 375-1411, Cometic 245-C5429
- Head Bolts: ARP 070-135-3606 or Manley 660-42192 Bolts & 660-42102 Washers
- Head Studs: ARP 070-235-4702 (12-point)
- Spark Plug Specs: 14 mm Thread, .750 in. (3/4) Reach, Gasket Seat
- Racing gas start with NGK 739-R5671A-9
- Alcohol start with NGK 739-R5671A-10
- Angle Milling: .0066 in. per cc
- Flat Milling: .0050 in. per cc
- Pushrod Slots: Standard
- Pushrods: Check pushrod clearance with head installed on the engine block before final assembly
- Stud Girdle: Standard, Brodix 158-BR1230
- Rocker Arms: Standard
- Lifters: Standard
- Pistons: 2 Degree Valve Rolled Piston
- Exhaust Pattern: Raised .600 in.
- Spring Pockets: May not be cut any larger or deeper than 1.625 in.
- Recommended Intake Manifold: Brodix BM 2017* (158-BM2017), BM 2027* (158-BM2027) - *Note: Oval Port Intake Manifold Must Be Port Matched to Fit Rectangular Port Heads
Flow (CFM @ 28 in. H20)
- Intake (Lift in. - CFM Flow)
- 0.200 - 163
- 0.300 - 237
- 0.400 - 307
- 0.500 - 361
- 0.600 - 401
- 0.700 - 406
- 0.800 - 401
- Exhaust (Inches of Lift - CFM Flow)
- 0.200 - 128
- 0.300 - 173
- 0.400 - 215
- 0.500 - 247
- 0.600 - 270
- 0.700 - 280
- 0.800 - 283
Specifications:
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.