500HP+ SBC Small Block Chevy 350 Cylinder Heads, Assembled complete suits Solid Flat Tappet, Max .740" lift

Pair DETROIT RACING PRODUCTS – DRP - Small Block Chevy 350 Cylinder heads. 

350 SMALL BLOCK CHEY ASSEMBLED CYLINDER HEADS TO SUIT SOLID FLAT TAPPET CAMSHAFT.

500HP and 460ft/lb of Torque from a 350 Small Block Chevy*

*Dyno results are from a 350 Chev with a Solid Flat Tappet.

DRP High Performance Cylinder Heads - Hand assembled inhouse using Comp Cams hardware and DRP Valves with PAC Racing Dual Valve Springs (hand built in Melbourne)

Sold as a Pair & Fitted with:

• DRP-8374S Dual Valve Springs by PAC Racing. 145lbs seat & 350lbs Open @ 0.550" LIFT. 
• Comp Cams - Retainers, Machined Race Locks, Spring Seats, Seals 
• Max lift:  0.740”
• DRP - 5000 Series valves - Stainless 241-N with a 30° back cut on the intake for improved flow and performance.

Please allow 2 days to assemble the heads. * If you need these sooner, just ask. 

• Angle Spark Plug - fits Ram Horn manifolds - see photo. 
• High Torque, High velocity inlet runners that flow 500hp @ .450" lift
• 196cc Intake runner volume + 75cc Exhaust
• 64cc Chamber size (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 
• Guide Seal Size 0.530" x 11/32
• Hard 355-T6 Aluminium - Race Quality.
• Race bred 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: Adjustable: Comp Cams 4835-8 & DRP-4835-8

Valves needed: Intake: 2.020" x 5.011" Long x 11/32" stem. Ferrea F5027

Valves needed: Exhaust: 1.600" x 5.011" long x 11/32" Stem. Ferrea f5025

* Performance Results will vary depending on your build and combination of other items. 

This Dyno test was carried out with a Solid Flat Tappet Camshaft,255/256 Duration and 0.540/0.534" valve lift with a 106 LSA. 1 3/4 Headers, Electrical Water pump, Edelbrock Victor Jnr Single plane intake (we feel you will achieve similar results with an air gap dual plane. 11:1 Compression with a domed Piston. 34°

350 CHEVY DYNO RUN - 500HP  https://www.youtube.com/watch?v=vpwIgJIN5X8

383 CHEVY DYNO RUN - LOW COMP 95 OCTANE  https://www.youtube.com/watch?v=iAEie9M4fz8

These heads flow 500hp @ 0.450" lift

Flow Figures*:         

Lift          Intake          Exhaust

200          145             106

300          192             135

400          232             160

450          242             168   

500          242             178   

550          242             179   

600          244             181

650          244             187   

700          245             190

* Flown on a Superflow 600 with a 4.030" Bore and a 30° back cut to the intake valve.