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Brodix 2021024 - Brodix Big Block Chevy BB-3 Xtra, BP BB-3 Xtra Aluminum Heads

Brodix 2021024 - Brodix Big Block Chevy BB-3 Xtra, BP BB-3 Xtra Aluminum Heads

Brodix#158-2021024

BB-2 XTRA Series Cylinder Head
  • 365cc Intake Ports
  • 119cc Combustion Chambers
  • 2.300'' Intake / 1.880'' Exhaust Valves
  • 1.550'' Dia. Springs - 240# Seat Pressure
  • Steel Retainers
  • Assembled, 1/pkg.

    Brodix 2021024 - Brodix Big Block Chevy BB-3 Xtra, BP BB-3 Xtra Aluminum Heads Details

    BB-2 XTRA Series Cylinder Heads

  • 365cc Intake Port Volume
  • 1.550'' Diameter Valve Springs - 550# Open, 240# Closed Spring Pressure
  • Cylinder Head Specifications
  • Intake Port Volume: 365cc - Rectangle Port
  • Combustion Chamber Volume: 119cc
  • Valves: 2.300'' dia. x 5.468'' o.a.l. Intake / 1.880'' dia. x 5.394'' o.a.l. Exhaust ( 11/32'' Stem Diameter )
  • Valve Springs: 1.550'' Diameter - Open Pressure: 550 lbs.; Closed Pressure: 240 lbs.; Installed Height: 1.950''; Max Lift: .700''
  • Spring Retainers: 1.550'' 10° Steel
  • Rocker Studs: 7/16''
  • Guide Plates: 3/8''
  • Valve Seals: 11/32''
  • Spark Plug Configuration: Angled

    Facts and Related Components
  • Torque Heads: 70 ft-lb.
  • Torque Rocker Studs: 40-45 ft-lb.
  • Intake Gasket: Brodix p/n 158-MG2001, Fel-Pro p/n 375-1252-3, Cometic p/n 245-C5428
  • Head Gasket: 4.310'' Bore - Fel-Pro p/n 375-1027, Cometic p/n 245-C5432; 4.540'' Bore - Fel-Pro p/n 375-1017, Cometic p/n 245-C5433; 4.600'' Bore - Fel-Pro p/n 375-1057, Cometic p/n 245-C5434
  • Exhaust Gasket: Fel-Pro p/n 375-1411 or Cometic p/n 245-C5429
  • Head Bolts: ARP p/n 070-135-3606, Manley p/n 660-42192
  • Head Studs: ARP p/n 070-235-4702 (12-point)
  • Spark Plug Specs: 14mm Thread, .750'' (3/4'') Reach, Gasket Seat
  • Valve Angle: 26° and 4° Intake, 17° and 4° Exhaust
  • Angle Milling: .0066'' per cc
  • Flat Milling: .0050'' per cc
  • Pushrod Slots: Standard
  • Pushrods: Check pushrod clearance with head installed on the engine block before final assembly
  • Stud Girdle: Standard, Brodix p/n 158-1230
  • Rocker Arms: Standard
  • Lifters: Standard
  • Pistons: Standard w/BB-2 X, BB-2 XTRA, BP BB-2 XTRA; Check Piston Valve Notches w/BB-3
  • Exhaust Pattern: Raised .600''
  • Valve Centerline: Standard w/BB-2 X, BB-2 XTRA, BP BB-2 XTRA; Exhaust Valve Moved .300'' w/BB-3
  • Spring Pockets: May not be cut any larger or deeper than 1.625''
  • Accessory Bolt Holes are Drilled
  • Recommended Intake Manifold: Brodix HV 2000 (p/n 158-HV2000) / HV 2001 (p/n 158-HV2001)

  • Brodix 2021024 - Brodix Big Block Chevy BB-3 Xtra, BP BB-3 Xtra Aluminum Heads

    More Power and Less Weight!

    The Brodix BB-3 Xtra has taken the conventional big block to the next level. These cylinder heads feature a valve angle that is rolled two degrees. The BB -3 XTRA is available in a rectangular-shaped or oval-shaped intake port configuration, and both are offered in an out-of-the box version or completely CNC ported. The out-of-the-box version comes standard with CNC ported 119 cc combustion chambers, CNC bowls blended and ports matched, and flow over 390 cfm.

    The BB-3 XTRA CNC ported version is available in two port volumes, 366 cc and 380 cc. The 380 cc version flows over 440 cfm. The BB-3 XTRA CNC ported oval ports are available in three port volumes: 332 cc, 351 cc, and 365 cc. This wide range of port volumes allows the oval port to compliment virtually any engine combination available. Port shape, port velocity, and the latest technology have propelled these cylinder heads to the top of their class! Made in the USA!

    Note: Sold Individually, unless otherwise noted.

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