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STS BB-4 XTRA Series Cylinder Heads390cc Intake Port Volume 1.550'' Diameter Valve Springs - 550# Open, 240# Closed Spring Pressure 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 Valves
- 1.550'' Dia. Springs - 240# Seat Pressure
- Titanium Retainers
- Assembled, 1/pkg.
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: 1.550' Diameter - Open Pressure: 550 lbs.; Closed Pressure: 240 lbs.; Installed Height: 1.950'; Max Lift: .700'
- Spring Retainers: 1.550' 10° Titanium
- Rocker Studs: 7/16'
- Guide Plates: 3/8'
- Valve Seals: 11/32'
- 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
Part FitmentSemi Universal
Vendor Part Number2048100
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
