725 SOUTH LA CADENA DRIVE COLTON CA USA 92324
909.291.7550

CBM MOTORSPORTS™ PRO-X™ CNC PORTED 6/4 BOLT COMPLETE LS3 CYLINDER HEADS

CBM MOTORSPORTS™ PRO-X™ CNC PORTED 6/4 BOLT COMPLETE LS3 CYLINDER HEADS

Part Number: CBM-PROX-C-6

Price: $3,299.99
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CBM MOTORSPORTS™ PRO-X™ CNC PORTED 6/4 BOLT COMPLETE LS3 CYLINDER HEADSCBM MOTORSPORTS™ PRO-X™ CNC PORTED 6/4 BOLT COMPLETE LS3 CYLINDER HEADSCBM MOTORSPORTS™ PRO-X™ CNC PORTED 6/4 BOLT COMPLETE LS3 CYLINDER HEADS
CBM MOTORSPORTS™ PRO-X™ CNC PORTED 6/4 BOLT COMPLETE LS3 CYLINDER HEADSCBM MOTORSPORTS™ PRO-X™ CNC PORTED 6/4 BOLT COMPLETE LS3 CYLINDER HEADSCBM MOTORSPORTS™ PRO-X™ CNC PORTED 6/4 BOLT COMPLETE LS3 CYLINDER HEADS
CBM MOTORSPORTS™ PRO-X™ CNC PORTED 6/4 BOLT COMPLETE LS3 CYLINDER HEADS

CBM MOTORSPORTS™ PRO-X™ CNC PORTED 6/4 BOLT COMPLETE LS3 CYLINDER HEADS Product Description:

CBM Motorsports™ Pro-X™ CNC ported aluminum cylinder heads will unleash the horsepower, torque and performance that your LS engine is capable of. CBM Motorsports™ Pro-X™ 6/4 bolt cylinder heads for, LS style engines are designed for 4.065” or larger bores and LS3/L92 intake ports they also feature a raised rocker rail for improved rocker arm/valve cover clearance and are capable of making well over 1000hp. We 100% CNC port all intake and exhaust runners, blend the bowls and match the ports.

The combustion chambers and ports have been carefully designed to achieve the very best combination of high flow capabilities along with outstanding port velocity. An improved deck thickness provides greater forced induction durability and reliability. REV stainless steel valves, Manley springs, retainers, locator's and locks make CBM Motorsports™ Pro-X™ heads for the LS a winning combination and ready to race.

After assembly and inspection the heads are packaged and shipped with care insuring you receive a killer pair of cylinder heads intact, as ordered and on time.

Cylinder Head Style:

  • Complete (valves, springs, retainers, locator's and locks). Rocker arms not included.

Available in a aftermarket 6 bolt or 4 bolt (standard) pattern.

Brand: CBM Motorsports
Part Numbers: CBM-PROX-C-4, CBM-PROX-C-6
Other Part Numbers: PROX-C-4,  PROX-C-6
Part Type: Cylinder Heads
Cylinder Head Style: Complete
Cylinder Head Material: Aluminum
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc):  70
CNC-Machined Combustion Chamber: Yes
Intake Runner Volume (cc): 280
Exhaust Runner Volume (cc): 105
CNC-Machined Intake Runner: Yes
CNC-Machined Exhaust Runner: Yes
Combustion Chamber Style: Open
Intake Port Shape: Rectangular
Intake Port Location: Standard
Exhaust Port Shape: D-port
Exhaust Port Location: Standard
Intake Valves Included: Yes
Exhaust Valves Included: Yes
Valve Springs Included: Yes
Damper Spring Included: Yes
Retainers Included: Yes
Locks Included: Yes
Valve Stem Seals Included: Yes
Rocker Arm Studs Included: No
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Guideplates Included: No
Accessory Bolt Holes Drilled: No
Valve Guides Included: Yes
Valve Seats Machined: Yes
Steam Holes Drilled: Yes
Oiling Style: Through Pushrod
Heat Crossover: No
Quantity: Sold in Pairs
In Store Pickup: Colton, CA, USA

Designed for LS style engines with a 4.065” or larger bore and LS3/L92 intake ports.

Assembly Specifications:


R.E.V. Stainless Steel Intake Valves.

  • Head Diameter: 2.220
  • Stem Diameter: .3110
  • O/A Length: 5.450
  • Tip Length: .290
  • Underhead Angle / Radius: 22° x 1/2”
  • Margin: .075
  • Seat Width: .100
  • Top of Head: 45° Dish
  • Groove Type: Bead Roll
  • Wgt/Grams: 125

R.E.V. Stainless Steel Exhaust Valves.

  • Head Diameter: 1.600
  • Stem Diameter: .3110
  • O/A Length: 5.450
  • Tip Length: .290
  • Underhead Angle / Radius: 10° x 3/8”
  • Margin: .065
  • Seat Width: .100
  • Top of Head: 45° Dish
  • Groove Type: Bead Roll
  • Wgt/Grams: 95

Manley Professional Valve Springs.

  • Max Valve Lift: .700"
  • OD: 1.550”
  • ID: .725"
  • Installed Pressure: 225 @ 1.950”
  • Open Pressure: 580 @ 1.250”
  • Rate (lbs/in): 507
  • Coil Bind: 1.190"
  • Wgt/Pr: 159gms

Manley Titanium Retainers.

  • Valve Spring Diameter: 1.550”"
  • Degree: 10°
  • Dimension A: 1.500”
  • Dimension B: 1.105”
  • Dimension C: .710”
  • Height: std.

Manley I.D. Valve Spring Locator's.

  • Locator ID: .570”
  • Locator OD: 1.535”
  • Thickness: .062"
  • Wall Shoulder Height: .140"
  • Shoulder Diameter: .720"

Manley Machined Valve Locks.

  • Valve Stem Diameter: 0.311"
  • Groove Type: Bead Loc
  • Angle: 10°
  • Wgt/Pr: 3.9gms

Download specifications and flow chart here.

COMETIC Head Gaskets LSX 4.165 bore. Part # COM-4165-PR

COMETIC Head Gaskets LSX 4.140 bore. Part # COM-4140-PR

GM Head Gasket LS7 4.150 bore. Part # GM-12582179

Yes.

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