Chevy Small Block Straight Plug Flat Tappet Assembled Aluminum Cylinder Head

Upgrade your Gen I Small Block Chevy engine with a fully assembled aluminum cylinder head designed to improve airflow, combustion efficiency, and horsepower potential. Featuring 198cc intake runners, 64cc combustion chambers, and 2.020" intake / 1.600" exhaust valves, these performance cylinder heads are built for street performance, muscle car, hot rod, restoration, street/strip, and bracket racing applications.

The optimized intake runner and combustion chamber design help increase airflow compared to many factory castings, supporting improved throttle response, stronger torque production, and greater horsepower potential throughout the RPM range. These Small Block Chevy aluminum heads are an excellent choice for 350 Chevy, 383 stroker, and other Gen I SBC performance builds seeking improved breathing and reduced weight.

Constructed from lightweight aluminum, these cylinder heads help reduce front-end weight while dissipating heat more efficiently than traditional iron heads. The assembled design includes valves, springs, retainers, locks, and seals, helping simplify installation for compatible flat tappet camshaft combinations.

Whether you're building a street-driven 350 Chevy, a torque-focused 383 stroker, or upgrading a classic muscle car or truck, these assembled aluminum cylinder heads provide the airflow capacity, durability, and performance-oriented design needed for serious Small Block Chevy engine builds.

 

Cylinder Head Technology
Designed with 198cc intake runners, 64cc combustion chambers, and 2.020" intake / 1.600" exhaust valves, these assembled aluminum cylinder heads are engineered to improve airflow and combustion efficiency in Gen I Small Block Chevy applications. The straight plug configuration maintains compatibility with many traditional Small Block Chevy header and spark plug arrangements while the aluminum construction helps reduce weight and improve heat dissipation.

Performance Benefits
The performance-oriented runner and chamber design help increase airflow into and out of the combustion chamber, supporting improved throttle response, stronger mid-range torque, and increased horsepower potential. Aluminum construction also helps transfer heat more efficiently than cast iron, making these cylinder heads a popular upgrade for street performance engines, muscle cars, hot rods, and street/strip combinations.

COMPATIBLE WITH
CHEVROLET SMALL BLOCK V8 GEN. I
• 4.3L / 262 in³
• 4.3L / 265 in³
• 4.4L / 267 in³
• 4.6L / 283 in³
• 4.9L / 302 in³
• 5.0L / 305 in³
• 5.0L / 307 in³
• 5.4L / 327 in³
• 5.7L / 350 in³
• 6.6L / 400 in³

COMMON VEHICLE APPLICATIONS
Chevrolet Camaro
Chevrolet Chevelle
Chevrolet Nova
Chevrolet El Camino
Chevrolet Impala
Chevrolet C10
Chevrolet C/K Series Trucks

NOTES
• Fits Gen I Small Block Chevy engines only (1955–1995)
• Straight plug design for traditional SBC applications
• Designed for flat tappet camshaft combinations
• Fully assembled with valves, springs, retainers, locks, and seals
• Verify engine component compatibility and clearances before installation
• Not compatible with LS, LT, or Big Block Chevy engines
• Cylinder head sold individually (purchase quantity of 2 required for complete engine).

SPECIFICATIONS
Assembled: Yes
CNC Ported: No
Combustion Chamber Style: Heart
Combustion Chamber Volume: 64 cc
Deck Height: Standard
Deck Thickness: Standard
Exhaust Crossover: No
Exhaust Port Height: 1.400 in.
Exhaust Port Location: Standard
Exhaust Port Shape: Square
Exhaust Port Width: 1.400 in.
Exhaust Valve Diameter: 1.600 in.
Exhaust Valve Material: Stainless Steel
Finish: Natural
Grade Type: Performance
Guide Plate Material: Chromoly Steel
Intake Port Height: 2.100 in.
Intake Port Location: Standard
Intake Port Shape: Rectangle
Intake Port Width: 1.180 in.
Intake Runner Volume: 198 cc
Intake Valve Diameter: 2.020 in.
Intake Valve Material: Stainless Steel
Material: Aluminum
Push Rod Diameter: 0.3125 in.
Quantity: Sold Individually
Spark Plug Style: Straight
Valve Angle: 23.0 deg.
Valve Guide Material: Bronze
Valve Seat Material: Steel
Valve Spring Retainer Material: Steel
Valve Springs Included: No
Valves Included: Yes
Weight: 19 lbs.