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Vehicle Info NeededSR 20 Series Cylinder Head CNC Ported
Ships on 11/09/2026
Lowest Price Guarantee- SR 20 Series Cylinder Head
- CNC Ported
- 440cc Intake Ports
- 95cc Combustion Chambers
- 2.400'' Intake / 1.800'' Exhaust Valves
- 1.645'' Dia. Springs - 315# Seat Pressure
- Titanium Retainers
- Assembled, Sold Individually
Cylinder Head Specifications - Intake Port Volume: 440cc
- Combustion Chamber Volume: 95cc
- Valves: 2.400' dia. x 6.030' o.a.l. Intake / 1.800' dia. x 5.930' o.a.l. Exhaust ( 11/32' Stem Diameter )
- Valve Springs: 1.645' Diameter - Open Pressure: 915 lbs.; Closed Pressure: 315 lbs.; Installed Height: 2.100'; Max Lift: .850'
- Spring Retainers: 1.625' 10° Titanium
- Rocker Studs: N/A
- Guide Plates: N/A
- 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-MG2021
- Head Gasket: 4.600' Bore - Fel-Pro p/n 375-1057 or Cometic p/n 245-C5434
- Exhaust Gasket: Fel-Pro p/n 375-1412
- Valve Cover Gaskets: Brodix p/n 158-MG2020
- Head Studs: N/A
- Head Bolt Washers: N/A
- Head Studs: Brodix SK HS SR 20 for Brodix Aluminum Block; AR 235-4323 for Cast Iron Block
- Spark Plug Specs: 14mm Thread, .750' (3/4') Reach, Gasket Seat
- Valve Angle: 20° and 4° Intake, 13° and 4° Exhaust
- Angle Milling: .0066' per cc
- Flat Milling: .0050' per cc
- Pushrod Slots: Special
- Stud Girdle: N/A
- Rocker Arms: Requires Shaft System - Jesel KPS 441184 or T&D 3142
- Lifters: Standard
- Exhaust Pattern: Standard
- Spring Pockets: May not be cut any larger or deeper than 1.750'
- Accessory Bolt Holes are Drilled
- Recommended Intake Manifold: Brodix BM 2020 Standard Deck (p/n 158-BM 2020) / BM 2021 Tall Deck (p/n 158-BM2021)
- Minimum Bore: 4.600'
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
Flows 507 CFM at .900 in. Lift!
20°/4° Intake & 13°/4° Exhaust Valve Angles
The Brodix SR 20 Series cylinder head is at the cutting edge of conventional Big Block Chevy compatible technology. This new offering raises the bar to a level that is unreachable by the competition! Inspired by TPSA technology, the SR 20 Series surpasses any other head in its class by leaps and bounds. Utilizing a .500 in. raised 440cc intake port with a 2.400 in. intake valve, this head flows an unheard of 507 CFM. The exhaust port flows an amazing 335 CFM through only a 1.800 in. valve. To allow for the newly designed 95cc combustion chamber, the intake valve angle of this head has been rolled to 20-degrees.
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This head requires pistons, valve covers, head studs, shaft rockers, and an intake manifold designed specifically for the SR 20 series cylinder head. As always, these heads come standard with all the fine qualities that only Brodix has to offer. 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.
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