MAST BLACK LABEL 295CC LS3 CYLINDER HEADS - NO SPRINGS - CH-LSX-600238

The Mast Motorsports cylinder head product line is completely manufactured from a raw casting to a finished cylinder head in the USA located in Nacogdoches Texas. 

Mast refuses to compromise on materials and methods that may jeopardize longevity, performance, and quality.  When buying Mast Cylinder heads, you are getting the highest level of quality and performance on the market. 

Full Send, no compromises, no shortcuts, ever.
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