Free Shipping & Handling on Orders Over $95 - Order by 11pm EST for Same-Day Shipping!
Shop By Vehicle
Shop By
All Categories

Gift Certificates
My Account
E-Mail Signup
Catalog Request

Brodix 2048102

STS BB-4 XTRA Series Cylinder Head CNC Ported

Part Number: 158-2048102

STS BB-4 XTRA Series Cylinder Head
  • CNC Ported
  • 390cc Rectangle Intake Ports
  • 119cc Combustion Chambers
  • 2.350'' Intake / 1.900'' Exhaust Valves
  • 1.645'' Dia. Springs - 330# Seat Pressure
  • Titanium Retainers
  • Assembled, 1/pkg.
  • $2,275.47
    Ships 11/01/16
    if Ordered Today
    Made In USA
    FREE Shipping
    Brodix 2048102 STS BB-4 XTRA Series Cylinder Head CNC Ported $2,275.47

    Brodix 2048102 Details

    STS BB-4 XTRA Series Cylinder Heads

  • 390cc Intake Port Volume
  • 1.645'' Diameter Valve Springs - 945# Open, 330# Closed Spring Pressure
  • 100% CNC Ported
  • Cylinder Head Specifications
  • Intake Port Volume: 390cc - Rectangle Port
  • Combustion Chamber Volume: 119cc
  • Valves: 2.350'' dia. x 5.568'' o.a.l. Intake / 1.900'' dia. x 5.494'' o.a.l. Exhaust ( 11/32'' Stem Diameter )
  • Valve Springs: 1.645'' Diameter - Open Pressure: 945 lbs.; Closed Pressure: 330 lbs.; Installed Height: 2.100''; Max Lift: .875''
  • Spring Retainers: 1.645'' 10° Titanium
  • 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, Cometic 245-C5428, Fel-Pro 375-1252-3
  • Head Gasket: 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: 24° and 4° Intake, 15° 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
  • Rocker Arms: Standard
  • Lifters: Standard
  • Pistons: 2° Valve Rolled Piston
  • Valve Centerline: Standard
  • Exhaust Pattern: Raised .600''
  • Spring Pockets: May not be cut any larger or deeper than 1.625''
  • Accessory Bolt Holes are Drilled
  • Recommended Intake Manifold: Brodix SA 2012 (p/n 158-SA2012) / SA 2020 (p/n 158-SA2020)

  • Specifications:

    Accessory Bolt Holes Drilled
    CNC-Machined Combustion Chamber
    CNC-Machined Exhaust Runner
    CNC-Machined Intake Runner
    Combustion Chamber Volume (cc)
    Cylinder Head Finish
    Cylinder Head Material
    Cylinder Head Style
    Damper Spring Included
    Exhaust Port Location
    Exhaust Port Shape
    Exhaust Valve Angle
    Exhaust Valve Diameter (in.)
    Exhaust Valves Included
    Guideplates Included
    Heat Crossover
    Intake Port Location
    Intake Runner Volume (cc)
    Intake Valve Angle
    Intake Valve Diameter (in.)
    Intake Valves Included
    Lock Style
    10 degree
    Locks Included
    Machined for O-Ring
    Maximum Valve Lift (in.)
    Number of Springs Per Valve
    Oiling Style
    Through pushrod
    Outside Diameter of Outer Spring (in.)
    Sold individually
    Retainer Material
    Retainers Included
    Rocker Arm Nut Thread Size (in.)
    Rocker Arm Nuts Included
    Rocker Arm Studs Included
    Rocker Arms Included
    Steam Holes Drilled
    Valve Cover Mounting Style
    Perimeter bolt
    Valve Guide Material
    Phosphorous bronze
    Valve Guides Included
    Valve Seat Machine Style
    Valve Seat Material
    Ductile iron
    Valve Seats Machined
    Valve Springs Included
    Valve Stem Seals Included
    Manufacturer's Part Number:

    Raised Intake and Exhaust Port Design!
    24°/4° Intake & 15°/4° Exhaust Valve Angles

    The Brodix BB-4 XTRA and BB-5 valve angles have been rolled 2-degrees from stock to produce more torque and less chamber volume. The BB-4 XTRA and BB-5 have a raised, rectangle-shaped intake port design (approximately .400'') allowing the short-turn radius a better air flow angle without sacrificing velocity. Others offer a similar version of these heads, but they have larger intake ports in the stock location. The competitor's low profile head slows down the air speed making the engine extremely lazy. The BB-4 XTRA heads are 100% CNC ported intake/exhaust ports, combustion chambers and fully blended bowls that flow an amazing 447 cfm and raised exhaust ports that flow 276 cfm with a 1.900'' exhaust valve.
    When Sonny Leonard designed the BB-5 cylinder head for larger cubic inch engines, he incorporated the most important things: correct port shape, volume, and velocity. The BB-5 have CNC'd intake port match, fully blended bowls and valve job. The intake/exhaust ports and combustion chambers remain as-cast. If you want to take the next step up from a standard 26/4 and 17/4 valve angle cylinder head, the Brodix BB-4 XTRA or BB-5 is the ticket! Standard features include an extra thick deck, high valve cover rail, and the best castings in the business.
    Every casting is poured from A-356 virgin aluminum and tested before Brodix utilizes their in-house processes such as finish machining and heat treating to assure that you receive the best products for your hard-earned money. Other features include a thick deck surface that is compatible with nitrous, drilled and tapped holes on the ends for standard drive accessories, phosphorous bronze valve guides and hardened valve seats installed for unleaded fuel. Sold Individually, 1/pkg. Made in the USA!

      VALVE SPRING   Specs
      1.550'' Diameter Valve Spring for Mechanical Flat Tappet & Hydraulic Roller Lifter Cam
  • Spring Pressure Open: 550 lbs.
  • Spring Pressure Closed: 240 lbs.
  • Installed Height: 1.950''
  • Max Lift: .700''
  •   1.625'' Diameter Valve Spring for Mechanical Roller Lifter Cam
  • Spring Pressure Open: 745 lbs.
  • Spring Pressure Closed: 255 lbs.
  • Installed Height: 2.050''
  • Max Lift: .800''
  •   1.645'' Diameter Valve Spring for Mechanical Roller Lifter Cam
  • Spring Pressure Open: 945 lbs.
  • Spring Pressure Closed: 330 lbs.
  • Installed Height: 2.100''
  • Max Lift: .875''
  • Items You Need