1 8
Top Street Performance

Chevy Small Block Angled Plug Flat Tappet Assembled Aluminum Cylinder Head

Chevy Small Block Angled Plug Flat Tappet Assembled Aluminum Cylinder Head

SKU: JM4120

$500.00
$500.00
Shipping calculated at checkout.

Low stock

Top Street Performance (TSP) is committed to providing high-quality performance parts while complying with emissions regulations. This product is designed for use on vehicles that comply with federal emissions regulations. It is the customer’s responsibility to verify that this part is legal for use in their state or local jurisdiction. Check with your local emissions authority before purchasing.

Product Details

Features

  • 198cc intake runners improve Small Block Chevy airflow
  • 64cc chambers support efficient combustion and power
  • Angle plug design helps improve header clearance
  • Fully assembled aluminum construction saves installation time

Description

Upgrade your Gen I Small Block Chevy engine with a fully assembled aluminum cylinder head engineered for improved airflow, throttle response, and performance potential. Featuring 198cc intake runners, 64cc combustion chambers, and 2.020" intake / 1.600" exhaust valves, these performance cylinder heads are designed for enthusiasts building 350 Chevy, 383 stroker, and other Gen I Small Block Chevy combinations.

The optimized runner and chamber design helps improve cylinder filling and combustion efficiency, supporting stronger torque, improved throttle response, and increased horsepower potential throughout the RPM range. The angle plug configuration can provide improved spark plug accessibility and additional clearance in many header combinations commonly used on street performance and racing applications.

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

Ideal for street performance vehicles, muscle car restorations, hot rods, classic trucks, bracket racing applications, and performance engine rebuilds, these Small Block Chevy aluminum cylinder heads provide the airflow capacity and durability needed for serious SBC performance builds.

Whether you're upgrading a 350 Chevy street engine, building a 383 stroker, or assembling a custom Gen I SBC project, these assembled aluminum cylinder heads deliver the performance-focused design and proven airflow characteristics performance enthusiasts demand.

 

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 angle plug configuration helps improve spark plug access and may provide additional header clearance in many performance builds. Lightweight aluminum construction reduces weight while providing excellent durability for street and racing use.

Performance Benefits
The performance-oriented port design helps support increased airflow compared to many factory cylinder heads, contributing to improved throttle response, stronger mid-range torque, and greater horsepower potential. Aluminum construction also dissipates heat more efficiently than cast iron, helping maintain more consistent operating temperatures in street performance, muscle car, hot rod, and racing applications.

Specs

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 Angled
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.

Engine Fitment

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 Impala
Chevrolet El Camino
Chevrolet C10
Chevrolet C/K Series Trucks

NOTES
• Fits Gen I Small Block Chevy engines only (1955–1995)
• Designed for flat tappet camshaft applications
• Angle plug cylinder head design
• Fully assembled with valves, springs, retainers, locks, and seals
• Verify component compatibility before installation
• Header clearance should be checked when using angle plug heads
• Fits perimeter-bolt valve covers and pre-Vortec intake manifolds.
• Not compatible with LS, LT Gen V, or Big Block Chevy engines
• Cylinder head sold individually (purchase quantity of 2 required for complete engine).

Q&A

Will these cylinder heads fit a Chevy 350?
Yes, they are designed for Gen I Small Block Chevy 350 applications.

Can these heads be used on a 383 stroker?
Yes, they are compatible with Gen I Small Block Chevy 383 stroker combinations.

Are these cylinder heads fully assembled?
Yes, they include valves, valve springs, retainers, locks, and valve seals.

What size intake runners do these heads have?
They feature 198cc intake runners.

What size combustion chambers do these heads use?
These cylinder heads feature 64cc combustion chambers.

What valve sizes are included?
They include 2.020" intake valves and 1.600" exhaust valves.

Are these angle plug cylinder heads?
Yes, they feature an angle plug spark plug design.

Are these designed for flat tappet camshafts?
Yes, this version is configured for flat tappet applications.

Can aluminum heads help reduce engine weight?
Yes, aluminum heads weigh less than comparable cast iron heads.

Do aluminum heads run cooler than iron heads?
Aluminum dissipates heat more efficiently, helping maintain more consistent operating temperatures.

Will angle plug heads affect header fitment?
Header clearance should always be verified, but angle plug heads can provide improved spark plug access in many applications.

Can these heads support a street performance build?
Yes, they are well suited for street performance, muscle car, hot rod, and street/strip applications.

Emissions Notice

This product is legal for off road use and non pollution controlled vehicles (1965 & older); however, it has not been tested or approved by the California Air Resources Board (CARB) for highway vehicles in the state of California. By purchasing this product, buyer agrees it will not be used on pollution controlled vehicles in California, or in a state with similar emissions regulations.