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STS BB-4 XTRA Series Cylinder Heads390cc Intake Port Volume Unassembled, Bare Head 100% CNC Ported
- STS BB-4 XTRA Series Cylinder Head
- CNC Ported
- 390cc Rectangle Intake Ports
- 119cc Combustion Chambers
- 2.350'' Intake / 1.900'' Exhaust Valve Sizes
- Bare, 1/pkg.
This head is sold as an unassembled bare casting. It is finished machined and includes valve guides and valve seats installed. This head does NOT include rocker studs, valves, springs, retainers or locks.
Cylinder Head Specifications - Intake Port Volume: 390cc - Rectangle Port
- Combustion Chamber Volume: 119cc
- Valve Sizes: 2.350' Intake / 1.900' Exhaust ( 11/32' Stem Diameter )
- Spark Plug Configuration: AngledFacts 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)
Part TypeCylinder Head
BrandBRODIX
Part CategoryPerformance Parts
Cylinder Head MaterialAluminum
Intake Port LocationRaised
Rocker Arm Nut Thread Size (In.)7/16"-20
Exhaust Valves IncludedNo
Locks IncludedNo
Retainers IncludedNo
Guideplates IncludedNo
Rocker Arms IncludedNo
Oiling StyleThrough pushrod
Rocker Arm Nuts IncludedNo
Cylinder Head FinishNatural
Valve Seats MachinedYes
Intake Valve Angle24
Valve Seat MaterialDuctile iron
Heat CrossoverNo
Valve Springs IncludedNo
Valve Seat Machine Style3-angle
Damper Spring IncludedNo
Valve Guides IncludedYes
Cnc-Machined Intake RunnerYes
Intake Valves IncludedNo
QuantitySold individually
Valve Stem Seals IncludedNo
Accessory Bolt Holes DrilledYes
Exhaust Port LocationStandard
Valve Guide MaterialPhosphorous bronze
Combustion Chamber Volume (Cc)119
Machined For O-RingNo
Exhaust Valve Angle24
Steam Holes DrilledNo
Rocker Arm Studs IncludedNo
Cylinder Head StyleBare
Part FitmentSemi Universal
Valve Cover Mounting StylePerimeter bolt
Intake Runner Volume (Cc)390
Cnc-Machined Exhaust RunnerYes
Cnc-Machined Combustion ChamberYes
Vendor Part Number2048000
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
