LS7 305cc 4.125" (+) Bore Pair Black Label CNC Cylinder Head
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: 5.550"
- Valve Angle: 12°
- Valve Spring Pocket Diameter: 1.65"
- Valve Spring Install Height: 1.900" (+)
- Head Stud Size: .493"
- Valve Guide OD: .502"
- Valve Job Type: Newen CNC 5 Angle
Air Flow & Performance Criteria
- Intake Max. Flow: 405 CFM @ 0.700"
- Exhaust Max. Flow: 254 CFM @ 0.700"
- Intake Average Flow: 265 CFM
- Exhaust Average Flow: 177 CFM
- Intake Seat Material: Ductile Iron
- Intake Port Volume: 305cc
- 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: Jesel
- Rocker Arm Type: Jesel Rocker Arms
- Guide Material: Phosphor Bronze
General
- Rocker Stand Type: Jesel
- Rocker Stands Included: No
- Rocker Stand Dowels Included: No
- Uses Stock Rocker Bolts: No
- Rocker Bolts Included: No
- Rocker Arm Type: Jesel Rocker Arms
- Head Bolt QTY: 6 Bolt Style
- Valve Cover Rail Height: + ½ inch
- Can use OE Valve Cover: Yes
Custom Options Available
- Chamber Softening
- Custom Chamber Sizing
- ½ inch head stud clearance
- Copper Exhaust & Intake Valve Seats