Katech Gen V LT4/LT5 Semi-Premium CNC Ported Assembled Cylinder Heads

Katech Gen V LT4/LT5 Semi-Premium CNC Ported Assembled Cylinder Heads

NEW GM CASTINGS · CNC PORTED · COMPETITION VALVE JOB · HAND BLENDED · .660-INCH DUAL SPRINGS

The Katech Gen V LT4/LT5 Semi-Premium CNC Ported Assembled Cylinder Heads provide a complete performance cylinder head package for compatible LT4 and LT5 applications using 7.5mm direct injection injectors. Each pair starts with brand-new GM cylinder head castings and receives Katech CNC porting, a multi-angle competition valve job, and hand blending before final assembly.

These heads feature new GM titanium intake valves, stock GM exhaust valves, stock GM valve guides, and a .660-inch dual valve spring package with titanium retainers. They are fully assembled, engraved with the Katech logo, and sold as a complete pair with no core exchange required.

Features & Benefits

• Brand-New GM Cylinder Head Castings
• Katech CNC Ported Intake and Exhaust Ports
• Multi-Angle Competition Valve Job
• Hand Blended
• New GM Titanium Intake Valves
• Stock GM Exhaust Valves
• Stock GM Valve Guides
• .660-Inch Dual Valve Spring Package
• Titanium Valve Spring Retainers
• Designed for Compatible LT4/LT5 Applications Using 7.5mm Direct Injection Injectors
• Katech Logo Engraved on Each Cylinder Head
• Fully Assembled and Ready to Bolt On
• No Core Exchange Required
• Sold as a Complete Pair

These cylinder heads are Proudly CNC Ported, Competition Valve Job Machined, Hand Blended, Engraved, and Hand Assembled by Katech Engineering in Clinton Township, Michigan, USA.

Technical Specifications

• Engine Family: GM Gen V LT4 / LT5
• Cylinder Head Castings: New GM Castings
• Porting: Katech CNC Ported Intake and Exhaust Ports
• Valve Job: Multi-Angle Competition Valve Job
• Finishing: Hand Blended
• Intake Port Volume: 313.4cc
• Exhaust Port Volume: 113cc
• Katech Chamber Volume: 68cc
• Intake Valves: New GM Titanium
• Exhaust Valves: Stock GM
• Valve Guides: Stock GM
• Valve Springs: .660-Inch Dual Valve Spring Package
• Valve Spring Retainers: Titanium
• Direct Injection Injector Size: 7.5mm
• Assembly: Fully Assembled
• Core Required: No
• Quantity: Pair

Katech Semi-Premium CNC Porting & Airflow

These Semi-Premium cylinder heads receive Katech CNC porting, a multi-angle competition valve job, and hand blending. The airflow data below represents the Katech CNC + Valve Job + Blending configuration and compares it with a production OEM LT4 cylinder head.

Port & Chamber Data

• Katech Intake Port Volume: 313.4cc
• OEM LT4 Intake Port Volume: 295cc
• Katech Exhaust Port Volume: 113cc
• OEM LT4 Exhaust Port Volume: 109.8cc
• Katech Chamber Volume: 68cc
• OEM LT4 Chamber Volume: 65.2cc

NOTE: Airflow figures are flow-bench test data and do not establish maximum allowable camshaft lift. Camshaft and valvetrain compatibility should be determined based on the requirements of the complete engine combination.

Vehicle & Engine Fitment

Chevrolet Corvette

• 2015–2019 Chevrolet Corvette C7 Z06 – LT4 6.2L Supercharged
• 2019 Chevrolet Corvette C7 ZR1 – LT5 6.2L Supercharged

Chevrolet Camaro

• 2017–2024 Chevrolet Camaro ZL1 – LT4 6.2L Supercharged

Cadillac

• 2016–2019 Cadillac CTS-V – LT4 6.2L Supercharged

Important Fitment Note: These cylinder heads are designed for compatible LT4/LT5 applications using 7.5mm direct injection injectors. Verify engine and injector configuration before ordering.

Semi-Premium vs. Premium

The primary difference between Katech Semi-Premium and Premium LT4/LT5 cylinder heads is the valve guide configuration. The Semi-Premium heads retain the stock GM valve guides, while the Premium configuration receives Katech Manganese Bronze Valve Guides.

What's Included

• (2) New GM LT4/LT5 Cylinder Head Castings, CNC Ported by Katech
• New GM Titanium Intake Valves
• Stock GM Exhaust Valves
• Stock GM Valve Guides
• .660-Inch Dual Valve Spring Package
• Titanium Valve Spring Retainers

Cylinder heads receive a multi-angle competition valve job and hand blending before being engraved and hand assembled at Katech Engineering. They are supplied fully assembled as a complete pair.

Why Choose Katech?

Since 1977, Katech has developed high-performance engines and components for professional motorsports, OEM development programs, and performance applications. Katech's Gen V LT cylinder head programs apply that experience to CNC port development, precision machining, valvetrain preparation, and final assembly.

The Semi-Premium LT4/LT5 cylinder heads combine new GM castings with Katech CNC porting, a multi-angle competition valve job, hand blending, .660-inch dual valve springs, and titanium retainers while retaining the stock GM valve guides. Each pair is prepared and assembled at Katech Engineering in Clinton Township, Michigan.