GPI LSA / LS9 / LS PD Blower Camshaft - LS SS4 Blower with 8620 Hardened Core Upgrade - SC-STG4-8620
Extreme-Output PD Blower Cam with Premium 8620 Hardened Core
The GPI LS SS4 Blower - 8620 Hardened Core Upgrade is the most aggressive, highest-performing camshaft in the GPI PD blower lineup, now strengthened with a premium 8620 hardened alloy core. Designed for LSA, LS9, and other positive displacement supercharged Gen IV LS engines, this cam is built for enthusiasts pushing their blower setups to the absolute limit.
This grind features a high lift profile and must be paired with dual .660" valve springs, hardened pushrods, and an AFM/DoD delete for safe and reliable operation. With the added strength of the 8620 core, the SS4 can withstand the extreme pressures, friction, and RPM demands of high-power PD blower applications.
Why the 8620 Hardened Core Upgrade?
The 8620 alloy upgrade undergoes a specialized case-hardening process that significantly improves durability while maintaining the ductility needed for long-term reliability. Benefits include:
- Stronger, more durable wear surfaces on cam lobes
- Superior resistance to friction and load from PD blowers
- Enhanced reliability at high boost and high RPM levels
- A premium choice for aggressive street/strip builds
If you want the most robust version of GPI's highest-output blower cam, the SS4 in 8620 form is the top-tier solution.
Built for Maximum Airflow & Top-End Power
While the SS1 through SS3 cams offer balanced blends of drivability and power, the SS4 prioritizes maximum airflow, maximum horsepower, and maximum RPM capability. This is the cam you choose for high-boost PD blower combinations that need every bit of top-end performance.
- Highest horsepower potential of the SS blower lineup
- Ideal for ZL1, CTS-V, ZR1 and other PD supercharged LS builds
- Extreme-performance focus for serious street/strip applications
- Backed by GPI's proven, track-tested engineering
Proven GPI Performance
GPI camshafts are among the most dominant components on racetracks nationwide. Their cam and head packages have repeatedly demonstrated industry-leading performance in LSA, LS9, and PD blower LS platforms. The SS4 continues this tradition, now enhanced with the superior durability of the 8620 alloy core.
Quick Specs
- Application: LSA / LS9 / PD supercharged LS engines
- Core Material: 8620 hardened alloy
- Cam Type: High lift blower cam
- Valvetrain: Dual .660" springs & hardened pushrods required
- AFM/DoD: Delete required
- Performance Level: Most aggressive in the SS blower series
- Intended Use: Maximum-effort street/strip & high-boost builds
Features & Benefits
- Premium 8620 hardened core for maximum durability
- Most extreme blower cam in the GPI SS lineup
- Engineered for top-end horsepower and airflow
- High-RPM stability for demanding PD blower applications
- Perfect for ZL1, CTS-V, ZR1 and other Gen IV supercharged LS cars
- Track-proven design backed by nationwide results
FAQs
Why choose the 8620 hardened core version of the SS4 cam?
The 8620 version provides significant improvements in surface durability and load resistance, making it ideal for high-boost blower LS engines that experience intense friction and pressure.
What supporting mods are required for the SS4 Blower cam?
You must use dual .660" valve springs, hardened pushrods, and an AFM/DoD delete. Proper gearing, converter selection, and tuning are also recommended for maximum performance.
Why Buy from Beefcake Racing?
Beefcake Racing provides expert guidance and proven performance solutions for supercharged LS platforms. From GPI camshafts to complete blower packages, our team can help you build the perfect high-power setup.
Call 1-855-827-7223 or email sales@beefcakeracing.com.
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