Replacement 5.3 Liter LT 3.780" Bore - Factory Mast OE Stock Replacement - Direct Injected - OE Valves

Factory Replacement - NO CNC Porting Introducing Factory Mast Gen 5 LT Replacement Cylinder Heads. Our team carefully inspects, pressure tests, machines, and qualifies our gently used factory OE heads.  We machine and qualify the deck, and all surfaces to better than factory. Great as a factory replacement cylinder head, or for your own porting applications. Full Send, no compromises, no shortcuts, ever. Dimensional Specs Bore Size: 3.780" (+) Weight: 30 lbs. 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