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Vehicle Info Needed-11X Series Cylinder Heads Spread Exhaust Port
Ships on 09/21/2026
Lowest Price Guarantee- -11X Series Cylinder Heads
- Spread Exhaust Port
- 225cc Intake Ports
- 67cc Combustion Chambers
- 2.080'' Intake / 1.600'' Exhaust Valve Sizes
- Angle Plug
- Bare, 2/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 studs, valves, springs retainers or locks.
Cylinder Head Specifications - Intake Port Volume: 225cc
- Combustion Chamber Volume: 67cc
- Valve Sizes: 2.080' Intake / 1.600' 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: Fel-Pro p/n 375-1206, Cometic p/n 245-C5414
- Head Gasket: Fel-Pro p/n 375-1003 (350ci) / 375-1004 (400ci) or Cometic p/n 245-C5399 (350ci) / 245-C5403 (400ci)
- Exhaust Gasket: Brodix p/n 158-MG1500 (Spread Port)
- Head Bolts: ARP p/n 070-134-3601 or Manley p/n 660-42313
- Head Bolt Washers: MANLEY p/n 660-42102
- Head Studs: ARP p/n 070-234-4301 (12-point)
- Spark Plug Specs: 14mm Thread, .750' (3/4') Reach, Gasket Seat
- Valve Angle: 23°
- Angle Milling: .0078' per cc
- Flat Milling: .0060' per cc
- Pushrod Slots: 40/60
- Stud Girdle: 40/60 Brodix p/n 158-BR6440
- Rocker Arms: Standard, T&D Economy 40/60 2256, Jesel 40/60 Shaft System KPS 01302
- Lifters: Standard
- Exhaust Pattern: Standard or Spread Port
- Valve Centerline: 40/60
- Spring Pockets: May not be cut any larger or deeper than 1.550'
- Accessory Bolt Holes are Drilled
- Recommended Intake Manifold: Brodix BM 1000(p/n 158-BM1000) / HV 1000 (p/n 158-HV1000) / HV 1002 (p/n 158-HV1002) / SE 100 (p/n 158-SE100) / SE 102 (p/n 158-SE102)
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Available Standard or Spread Exhaust Ports
23° Intake & Exhaust Valve Angles
The Brodix Small Block Chevy -11X Series Aluminum Cylinder Heads are available with a standard or spread exhaust port pattern. This 23° head flows 285 cfm @ .700'' lift straight out-of-the-box with as-cast runners and chambers. The BP -11X Series heads feature CNC ported combustion chambers that flow up to 316 cfm @ .700'' lift. Brodix recommends this head be installed on a 400ci+ engine. The -11X requires a special stud girdle and longer pushrods. Piston valve notches must be checked for clearance. A valve length of .150'' longer than stock is required.
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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. The industry standard has been taken to the next level with modernized CNC porting. 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 in Pairs. ! | |||
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