MAST BLACK LABEL LS3 CYLINDER HEADS - 295CC RUNNER - BARE WITH VALVES - CH-LSX-600211

Mast Motorsports offers the most comprehensive LS & LT Line of Cylinder Heads. Starting with a raw casting, and complete the machining process 100% in house. Mast designs and manufacture their castings exclusively with their foundry partner.  Mast Castings have been designed to withstand the extremes of all forms of racing and performance.  Manufactured from A356 T6 Material, they are fully heat treated and pressure tested. Mast completes the manufacturing process using state of the art Hurco 5 Axis CNC machines – from raw casting to completed head in Nacogdoches, Texas. A premium casting and cylinder isn’t complete unless you match it with premium components.  Mast exclusively utilizes Made in the USA CHE Valve Seats and Valves Guides to complement the premium Black Label Cylinder Heads. There is no question CHE offers the best and finest in materials, machining, and longevity that ensures years of performance and quality. Finishing and valve jobs are completed using only the best CNC valve job process utilizing a Newen CNC valve cutting machine. 

Dimensional Specs

Bore Size: 4.125" (+)
Weight: 27.5 lbs.
Intake Valve Size: 2.250"
Exhaust Valve Size: 1.600"
Valve Stem Diameter: 5/16"
Valve Length: 5.450"
Valve Angle: 12°
Valve Spring Pocket Diameter: 1.65"
Valve Spring Install Height: 1.800"
Head Stud Size: .493"
Valve Guide OD: .502"
Valve Job Type: Newen CNC 5 Angle
Air Flow & Performance Criteria

Intake Max. Flow: 397 CFM @ 0.700"
Exhaust Max. Flow: 248 CFM @ 0.700"
Intake Average Flow: 254 CFM
Exhaust Average Flow: 176 CFM
Intake Seat Material: Ductile Iron
Intake Port Volume: 295cc
Exhaust Port Volume: 106cc
Standard Chamber Volume: 70cc
Port Type: CNC
Materials

Cylinder Head Material: A356-T6 Aluminum
Intake Valve Seat Material: Ductile Iron
Exhaust Valve Seat Material: Ductile Iron
Deck Thickness: .750"
Rocker Stand Type: Mast Billet
Rocker Arm Type: OE LS7 1.8 or Aftermarket
Guide Material: Phosphor Bronze
General

Rocker Stand Type: Mast Billet
Rocker Stands Included: Yes
Rocker Stand Dowels Included: Yes
Uses Stock Rocker Bolts: No
Rocker Bolts Included: No
Rocker Arm Type: OE LS7 1.8 or Aftermarket
Head Bolt QTY: 6 Bolt Style
Valve Cover Rail Height: + ½ inch
Can use OE Valve Cover: Yes