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Top Street Performance

Pro Series 8620 LS Stroker Hydraulic Roller Racing Camshaft

Pro Series 8620 LS Stroker Hydraulic Roller Racing Camshaft

SKU: 75383

$451.00
$451.00 $512.50
Shipping calculated at checkout.

In 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.
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Product Details

Features

  • Fits GM LS Gen III/IV engines for high-output stroker and racing applications
  • Racing | 246° intake / 254° exhaust duration | 110° lobe separation
  • Hydraulic Roller design with 0.621" intake / 0.604" exhaust lift for strong airflow and power
  • Requires 0.660 in. valve springs; 3-bolt cam gear attachment for high-RPM racing and stroker applications

Description

Upgrade your GM LS engine with this racing hydraulic roller camshaft engineered for high-RPM racing and stroker builds. Designed to improve airflow, throttle response, and power across the RPM range, this camshaft delivers a stronger, more aggressive performance profile.

Performance Gains & Powerband Optimization
With 246° intake / 254° exhaust duration, 0.621" intake / 0.604" exhaust lift, 110° lobe separation, this camshaft profile is designed to increase horsepower and torque while matching the intended powerband.

Hydraulic Roller Valvetrain Design
Hydraulic Roller construction supports stable valvetrain operation and efficient performance in modern GM LS engine combinations.

Durable Performance Construction
8620 Carburized Nickel Chromium Molybdenum construction provides strength and reliability for demanding street, strip, and performance engine builds.

Installation & Supporting Components
Proper tuning, piston-to-valve clearance verification, and matching valvetrain components are recommended. Recommended valve springs: 0.660 in..

Specs

Cam TypeHydraulic Roller
Camshaft Gear Attachment3-bolt
Computer Controlled CompatibleYes
Exhaust Duration at .050 inch Lift254 deg.
Exhaust Valve Lift with Factory Rocker Arm Ratio0.604 in.
Grade TypePerformance
Intake Duration at .050 Inch Lift246 deg.
Intake Valve Lift with Factory Rocker Arm Ratio0.621 in.
Lifter TypeHydraulic Roller
Lobe Separation110 deg.
Material8620 Carburized Nickel Chromium Molybdenum
Performance LevelRacing
Valve Springs Required0.660 in.

Engine Fitment

COMPATIBLE WITH
GM LS SERIES V8 ENGINES
• 4.8L / 293 in³ (LR4, LY2)
• 5.3L / 325 in³ (LM7, L59, L33, LC9, LH6, LY5, LMG)
• 5.7L / 346 in³ (LS1, LS6)
• 6.0L / 364 in³ (LQ4, LQ9, LY6, L76, L96)
• 6.2L / 376 in³ (LS3, L92, L99)

COMMON VEHICLE APPLICATIONS
Chevrolet Silverado / GMC Sierra (LS equipped)
Chevrolet Camaro / Corvette (LS equipped)
Chevrolet Tahoe / Suburban / Yukon (LS equipped)
Pontiac GTO / G8 (LS equipped)

NOTES
Designed for GM Gen III/IV LS-based engines.
Verify cam gear, timing set, sensor, and VVT/non-VVT compatibility before installation.
Camshaft applications require proper valve springs, ECU tuning, and piston-to-valve clearance verification.
Not compatible with Gen I Small Block Chevy, Gen V LT direct-injection, or Big Block Chevy engines.

Q&A

What applications is this camshaft compatible with?
This camshaft is designed for COMPATIBLE WITH, CHEVROLET SMALL BLOCK V8 GEN. III/IV (LS BASED), 4.8 L / 293 in3, 5.3 L / 325 in3, 5.7 L / 346 in3, 6.0 L / 364 in3, 6.2 L / 376 in3, 7.0 L / 428 in3.


Will this camshaft fit my engine?
This camshaft is intended for GM LS applications and should be matched to your engine configuration and valvetrain setup.


What does a camshaft do?
A camshaft controls the opening and closing of engine valves, which directly affects engine performance, power, and RPM characteristics.


Will this camshaft increase horsepower?
Yes, a performance camshaft can increase horsepower and torque when properly matched to your engine setup.


Is this camshaft suitable for street or race use?
This camshaft can be used in street or performance builds depending on its specifications and supporting components.


Do I need supporting modifications for this camshaft?
Yes, camshaft upgrades often require supporting components such as upgraded valve springs, pushrods, and tuning.


Will this camshaft affect idle quality?
Yes, camshaft specifications such as duration and LSA can affect idle sound and smoothness.


Do I need tuning after installing this camshaft?
Yes, camshaft upgrades typically require ECU tuning to optimize performance and drivability.


Is this a good upgrade over a stock camshaft?
Yes, this camshaft is a strong upgrade for improving engine performance when paired with the proper setup.


Can this camshaft be used in performance builds?
Yes, camshafts are commonly used in performance and custom engine builds.

Emissions Notice

This Top Street Performance (TSP) product is designed for racing and off-road competition use only. It is not legal for use on public roads or emissions-controlled vehicles and does not comply with federal, state, or local emissions regulations. The buyer assumes all responsibility for legal use and installation.

What is a Emissions-Controlled Vehicle?
"An emissions-controlled vehicle is any vehicle equipped with a factory-installed emissions control system designed to reduce air pollution. These systems include catalytic converters, oxygen sensors, EGR (Exhaust Gas Recirculation) valves, and diesel particulate filters (DPF). Most vehicles manufactured after 1975 are considered emissions-controlled and must comply with federal and state emissions laws when used on public roads."