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Vehicle Info NeededST 5.0 R Series Cylinder Head 171cc Intake Ports
Ships on 11/27/2026
Lowest Price Guarantee- ST 5.0 R Series Cylinder Head
- 171cc Intake Ports
- 60cc Combustion Chambers
- 1.940'' Intake / 1.600'' Exhaust Stainless Steel Valves
- 1.470'' Dia. Springs - 125# Seat Pressure
- Steel Retainers
- Assembled, 2/pkg.
Cylinder Head Specifications - Intake Port Volume: 171cc
- Combustion Chamber Volume: 60cc
- Valves: 1.940' dia. x 4.920' o.a.l. Stainless Steel Intake / 1.600' dia. x 4.940' o.a.l. Stainless Steel Exhaust ( 11/32' Stem Diameter )
- Valve Springs: 1.470' Diameter - Open Pressure: 325 lbs.; Closed Pressure: 125 lbs.; Installed Height: 1.900'; Max Lift: .575'
- Spring Retainers: 1.430' 7° Steel
- Rocker Studs: N/A
- Guide Plates: 5/16'
- Valve Seals: 11/32'
- Spark Plug Configuration: AngledFacts and Related Components
- Torque Heads: 100 ft-lb. with 1/2' Studs; 70 ft-lb. with 7/16' Studs
- Torque Rocker Stands: 30 ft-lb.
- Torque Rocker Studs: 40-45 ft-lb.
- Intake Gasket: Fel-Pro 1250 (p/n 375-1250)
- Head Gasket: Fel-Pro p/n 375-1011-1 or 375-1011-2
- Exhaust Gasket: Fel-Pro p/n 375-1487
- Head Bolts: ARP p/n 070-154-3605 (289-302ci); 070-154-3603 (351ci)
- Head Studs: ARP p/n 070-154-4005 (289-302ci); 070-154-4203 (351ci)
- Spark Plug Specs: 14mm Thread, .750' (3/4') Reach, Gasket Seat
- Valve Angle: 20° Intake, 20° Exhaust
- Angle Milling: N/A
- Flat Milling: .0060' per cc
- Valve Centerline: 53/119
- Rocker Arms: Ford Stock 5.0 Standard Non-Adjustable Rockers (Ford Motorsports p/n M6564-B351) for St 5.0 Series; Any Ford Roller Rockers with 7/16' Rocker Studs for ST 5.0 R Series
- Lifters: Standard
- Spring Pockets: May not be cut any larger or deeper than 1.550'
- Accessory Bolt Holes are Drilled
- Recommended Intake Manifold: Small Block Ford
- Air Tube: Stock air tube can be used with minor modifications
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
50+ Horsepower Increase Over Stock
Small Block Ford Heads!
20° Intake & Exhaust Valve Angles
The Brodix ST 5.0 Series cylinder head was developed to fit the Ford Windsor engine. Out of the box, completely assembled ST 5.0 series heads produce a 50 horsepower increase over other stock heads, and the combustion chambers may be milled into the mid-50cc range. All existing stock Ford 5.0L accessories (including the stock non-adjustable rocker arms which are required use on the ST 5.0 series) can be used in the installation of the Brodix ST 5.0 series. A modified version, the Brodix ST 5.0 R series, allows the use of 7/16'' Ford roller rockers.
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The exhaust ports are raised .500'' higher than stock Windsor heads on both versions. The BP ST 5.0 R series is completely CNC ported and outflows all other heads in its class. While creating the 100% CNC Ported BP ST 5.0 R series, the professionals at Brodix invested many long hours on the flow bench and at the track developing a completely ported cylinder head. The bottom line is that Brodix builds you the most accurate, best flowing out-of-the-box cylinder heads available at the best price. 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 in Pairs, 2/pkg. !
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