Assembled Solid Roller PAIR SBC Small Block Chevy CNC ported Cylinder heads DRP 23 deg 64cc Angle

PAIR SBC 225 CNC Cylinder heads Assembled Solid Roller Street 23Â° 64cc Alloy Angle Plug Small Block Chevy

Description

This sale is for a CNC Ported Pair, with as Cast Chambers.

Assembled & suitable for Street Solid Roller, max 7000 RPM & .650" lift.

Utilising Comp Cams Street Series Valve Springs.

DETROIT RACING PRODUCTS Cylinder heads.

Chev 23 Degree DRP Aluminium Cylinder heads

DRP’s Small Block Chevy 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. These CNC versions are an improvement on the As Cast versions.

DRP have not CNC machined the combustion chambers, because they dont have to. The Chambers are perfect as cast! An added benefit is the combustion chamber stays small, maintaining compression.

Angle Spark Plug
CNC Port Shape, High Torque inlet runners that flow 573hp @ .600" lift
228cc Intake runner volume (CNC Ported)
88cc Exhaust (CNC Ported)
64cc Chamber size (As Cast) (these heads can be milled down to 60cc)
Crisp throttle response.
Internal Cast Quality + Thick ( Super Smooth Water Jackets for maximum flow - see our photos of the internal casting)
Optimal Spark Plug position. The copies dont have this location.
Premium Bronze Valve Guides. 0.570" OD
Use Valve Stem Steals: Comp Viton: 518-16 Teflon: 503-16
Seal Size 0.530" x 11/32
Hard 355-T6 Aluminium - Race Quality.
3 Angle Valve Seats
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 1205 std Port or Felpro 1206 for Ported
Recommended Guide Plates: Comp Cams 4835-8 / DRP-4835-GP
Valves needed: Intake: 2.020" x 5.011" Long x 11/32" stem. Ferrea Part F5027-8
Valves needed: Exhaust: 1.600" x 5.011" long x 11/32" Stem. Ferrea Part F5025-8
Intake valve seat can be cut to accomodate a 2.080" Valve diameter.

These heads flow HP all with a 2.02" diameter valve. (can be taken out to 2.080" valve)

593hp @ 0.700" lift

573hp @ 0.600" lift

553hp @ 0.500" lift

Flow Figures*:

Lift Intake Exhaust

200 141 98

300 197 126

400 241 154

450 259 165

500 269 174 553hp

550 272 182

600 278 188 573hp

650 284 192

700 288 197 593hp

* Flown on a Superflow 600 with a 4.030" Bore and a 30° back cut to the intake valve. No pipe on the exhaust.

*Output will be determined by your combination and quality of the motor build.

We can assemble using Ferrea Valves and Comp Cams Hardware.

Have confidence and pride these are quality items Hand Assembled right here in Melbourne Australia.

Exceptional Quality for a Wow factor of a price!

*See the photo of the internal cast quality. We cut a cylinder head in half to verify the thickness and quality. These castings are exceptional quality.

These Cylinder heads flow and work like you wont believe. Best Bang for your Buck!

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

We do offer Complete assemblies, valves, springs, retainers to suit your application, see our other listings for various assemblies to suit your camshaft. We use Ferrea Valves, DRP Stainless Steel Valves and Comp Cams hardware.

Always trust TOTAL PERFORMANCE for the right parts.

Established in 1979

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THANK YOU FOR YOUR INTEREST.