670hp Boosted LS3 Cylinder Heads 265cc LS2 LS3 L92 Rectangle Port, Assembled, Ferrea Valves, Proline RPM Springs (PAC)

670HP Assembled LS3 Cylinder Heads suits Boosted Applications. (Moderate Boost)

Comes with Ferrea Super Alloy Valves(Inconel) & High RPM Proline Springs (PAC)

LS3 Rectangle Port Cylinder Heads

LS3 - L92 style Cylinder Heads - 4 BOLT + 15° valve angle (standard angle). 

670HP! Bolt on power upgrade. Rectangle Port. Complete with Valves & PAC Dual Valve Springs. 

These LS3 cylinder heads are bolt on horse power upgrades. No need to rebuild or CNC port your old cylinder heads, just fit these assembled LS3 Cylinder heads, bolt on and go! Perfect upgrade LS cylinder heads, CNC multi angle valve seats and all factory mounting points. Everything will swap over. Oustanding quality castings, you wont be dissapointed. These LS3 heads are assembled and come complete with high quality DRP valves that are made in Argentina. Fitted out with PAC Polished Dual Vavle springs. 

Quantity: Sold as a PAIR

Application: Moderate Boost applications. 

Valves:  Ferrea Super Alloy Exhaust for boost & 6000 series intake valve

Valve Springs: PAC Dual Valve Springs - DRP Polished Proline RPM Series 

Valve Springs Specs: DRP-8415P  160lbs@1.800" 417lbs/in, 0.670" lift

Guides: Bronze Guides 

Material:  Hard 356 Aluminium -  Race Quality.

Valve Seats:  3 Angle Valve Seats

Intake Port Volume:    264cc

Exhaust port Volume:  86cc

Chamber size:  66cc

Intake Valve size:  2.165"

Exhaust Valve size: 1.600"

Valve Angle:                    15° (stock)

Min bore dia:                   4.000"

Intake port location: stock

Exhaust port location: stock

Quantity Sold:  Pair (2 bare cylinder heads)

Flow Figures: 4.000" Bore @28"

Lift          Intake   Exhaust

200      134       108

300      201       145

400      256       169

500      295       189

550      303       197

600      312       202      643 HP*

650      320       207      660 HP*

700      325       210      670 HP*

750      328       212

* HP ratings are a Potential what the cylinder head can produce based on calculations from air flow testing. Your actual results will depenend on the motor build and other components and build.