Description
Mast Factory 5.3L Gen V LT 273cc/58cc 3.780 OE Port Cylinder Heads w/ Refurbished OE Valves – Direct Injection – CH-LTX-310500
Factory Replacement – NO CNC Porting
Introducing Factory Mast Gen 5 LT Replacement Cylinder Heads.
Mast carefully inspects, pressure tests, machines, and qualifies our gently used factory OE heads. Mast machines and qualifies the deck, and all surfaces to better than factory.
Great as a factory replacement cylinder head, or for your own porting applications.
Dimensional Specs
- Bore Size:3.780″ (+)
- Weight:30lbs.
- Intake Valve Size:1.928“
- Exhaust Valve Size:1.556″
- 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:.427″
- Valve Guide OD:.500″
Air Flow & Performance Criteria
- Intake Average Flow:217
- Exhaust Average Flow:156
- Intake Seat Material:OE Seat Material
- Intake Port Volume:273cc
- Exhaust Port Volume:114cc
- Standard Chamber Volume:58cc
- Port Type:OE Port
Materials
- Cylinder Head Material:319-T7 Aluminum
- Intake Valve Seat Material:OE Seat Material
- 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:4Bolt Style
- Valve Cover Rail Height:+ ½ inch
- Can use OE Valve Cover:Yes
Custom Options Available
- Head Assembly
