Full Send Late Model Performance
Factory Mast Cylinder Heads LT 4.065" (+) Bore - Pair Factory Mast CNC Port Cylinder Heads - OE or Aftermarket Valves
Factory Mast Cylinder Heads LT 4.065" (+) Bore - Pair Factory Mast CNC Port Cylinder Heads - OE or Aftermarket Valves
Factory Mast Cylinder Heads LT 4.065" (+) Bore - Pair Factory Mast CNC Port Cylinder Heads - OE or Aftermarket Valves
Factory Mast Cylinder Heads LT 4.065" (+) Bore - Pair Factory Mast CNC Port Cylinder Heads - OE or Aftermarket Valves
$ 1,999.00

LT 4.065" (+) Bore - Pair Factory Mast CNC Port Cylinder Heads - OE or Aftermarket Valves

− +

Only left in stock

---->Download the cylinder head spec sheet<----

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: 4.065" (+)
  • Weight: 30 lbs.
  • Intake Valve Size: 2.126" OE/2.165" Large Valve
  • Exhaust Valve Size: 1.590"
  • Valve Stem Diameter: 8mm
  • Valve Length: 5.550"
  • Intake Valve Angle: 12.5°x2.61°
  • Exhaust Valve Angle: 12°x2.38°
  • Valve Spring Pocket Diameter: 1.325"
  • Valve Spring Install Height: 1.880"
  • Head Stud Size: .472"
  • Valve Guide OD: .500"
  • Valve Job Type: Newen CNC 5 Angle

Air Flow & Performance Criteria

  • Intake Max. Flow: 350 CFM OE / 379 CFM Large Valve @ 0.700"
  • Exhaust Max. Flow: 214 CFM @0.700"
  • Intake Average Flow: 251 CFM OE / 270 CFM Large Valve
  • Exhaust Average Flow: 157 CFM
  • Intake Seat Material: OE Seat Material/Ductile Iron (Large Valve)
  • Intake Port Volume: 301cc
  • Exhaust Port Volume: 112cc
  • Standard Chamber Volume: 60cc
  • Port Type: CNC

Materials

  • Cylinder Head Material: 319-T7 Aluminum
  • Intake Valve Seat Material: OE Seat Material/Ductile Iron (Large Valve)
  • Exhaust Valve Seat Material: OE Seat Material
  • Deck Thickness: .300"
  • Rocker Stand Type: Pedestal
  • Rocker Arm Type: LS7 Exhaust 1.8 Ratio
  • Guide Material: Powdered Metal

General

  • Rocker Stand Type: Pedestal
  • Rocker Stands Included: Built-In
  • Rocker Stand Dowels Included: N/A
  • Uses Stock Rocker Bolts: No
  • Rocker Bolts Included: No
  • Rocker Arm Type: LS7 Exhaust 1.8 Ratio
  • Head Bolt QTY: 4 Bolt Style
  • Valve Cover Rail Height: + ½ inch
  • Can use OE Valve Cover: Yes

Custom Options Available

  • Head Assembly