530HP 185cc PAIR Ford V8 SBF 289 302 351W Windsor Aluminium Alloy Cylinder Heads BARE

Ford Windsor Small-Block 302W and 351W Cylinder Heads.

DRP’s Small Block Ford cylinder heads offer a cylinder head with improved port and combustion chamber designs that result in “Bolt on Horsepower”!

Cylinder Heads play such a critical role in your engine and performance cylinder heads usually come at a significant cost. The DRP range of Cylinder heads are easy on the budget while delivering on performance, precision and quality. The DRP “as-cast” ports and chambers perform out of the box.

All DRP Cylinder Heads are manufactured using a permanent steel mold, ensuring consistency and clean water jackets for a cooler running motor. Made from premium 355-T6 Hard Aluminium material, these heads wont go soft. Having ductile-iron CNC 3 angle valve seats, CNC surfaces, strict quality-control checks, these are a true premium quality product.   

With dyno proven results and years in service, you won’t find any better valued performance cylinder head.

Dont waste your time or money on rebuilding old Cast Iron units. Forget the headaches of poor valve seats, crack testing woes and restrictive ports of old cylinder heads - upgrade now!

Small Block Ford 20° Aluminium Cylinder Heads.

With 185cc intake runner size, the heads are on the larger side for the 302-based street engine, while being perfect for Hot 302’s and 347 Strokers and upgrades in a 351 Windsor engines. Valve sizes are 2.020" Intake and 1.600" Exhaust. The key is in the design of the port shape. Offering velocity for sharp responsiveness and gobs of Torque, while having the port volume to still carry the HP through the RPM range! They flow 500HP @ just 0.450” lift and 537 HP @ just 0.600” lift while maintaining the flow right through to 0.700” lift! This is all achieved on a 4.030” bore and out of the box! These same cylinder heads have produced 600HP having the chamber opened up to match the larger 4.125” bores in the 360 cube small blocks! The internal cast quality of the water jackets are super smooth for maximum flow to keep your motor cool while under maximum load.

The SBF heads utilise OEM mounting points so fitting up accessories are not a problem. The port sizes and locations will work with both 8.2-deck 302-based engines and 9.5-deck 351W-based combinations. The cylinder heads accept the 351W ½” head bolts and included in the box are hardened step down washers for using the smaller 302W 7/16” head bolts. Rocker studs use a 7/16 thread base and 1 piece guide plates can be used to simplify your valve train package.

The DRP cylinder head range are available Bare or Assembled using proven quality valve train components.

• Internal Cast Quality ( Super Smooth Water Jackets for maximum flow - see our photos of the internal casting) 
• Optimal Spark Plug position. 
• Premium Bronze Valve Guides.
• Hard 355-T6 Aluminium - Race Quality.
• 3 Angle CNC Valve Seats
• Inlet Port Volume: 185cc
• Exhaust Port Volume: 64cc
• Chamber Size:  60CC Chambers
• Intake Valve size: 2.02" 
• Exhaust Valve size: 1.60"
• Recommended Spark Plugs: 750 reach gasketed 5/8 hex. NGK-BCPR7ES
• Recommended Intake Gaskets: Felpro 1262
• Recommended Guide Plates: Comp Cams 4816-8
• Minimum Chamber size 54cc (can be machined down)
• Flat Mill:   .006" per cc (54cc minimum chamber size)

Flow Figures: Taken at 28"hg on a 4.030" Bore.

HP figures are "Potential" based on Flow/Velocity calculations* 

Lift          Intake          Exhaust

200          120               87

300          181             134

400          223             159

450          244             163   -   503hp* + Exh flow 66% of Inlet

500          250             167   -   516hp*

550          256             168   -   530hp* + Exh flow 66% of Inlet

600          260             167   -   537hp* + Exh flow 64% of Inlet

650          261             169   

700          262             168