GPI LSA / LS9 / LS PD Blower Camshaft - LS SS1 Blower with 8620 Hardened Core Upgrade - SC-STG1-8620
Enhanced-Durability Blower Cam for LSA, LS9 & PD-Supercharged LS Engines
The GPI LS SS1 Blower - 8620 Hardened Core Upgrade takes the already outstanding LS SS1 blower cam and elevates it with a premium 8620 core hardening process. Engineered for LSA, LS9, and other positive displacement supercharged LS engines, this cam delivers outstanding street manners while providing the extra strength and wear resistance demanded by boosted applications.
Just like the standard SS1 Blower cam, this grind offers a stable 675 RPM idle, excellent low-end torque, quiet valvetrain operation, and compatibility with the stock torque converter. Power hits strong from off idle and carries aggressively to roughly 6600 RPM, making it ideal for daily driven or lightly modified supercharged setups.
High Lift Valvetrain Requirements
This cam features a high lift profile and requires specific supporting components to ensure proper function, reliability, and valvetrain control - especially under boost. GPI specifies:
- Dual .660" valve springs
- Hardened pushrods
- AFM / DoD delete (required for compatibility)
Why Choose the 8620 Hardened Core?
The 8620 upgrade introduces a specialized hardening process that enhances the camshaft's ability to withstand the friction, pressure, and heat produced by positive displacement superchargers. This metallurgy provides:
- Superior surface wear resistance on cam lobes
- Increased strength while maintaining desirable ductility
- Long-term durability under higher loads
- A premium solution for supercharged builds seeking maximum reliability
The result is a stronger, more resilient camshaft built to thrive in demanding PD blower environments - making the 8620 SS1 an excellent choice for owners who want top-tier longevity alongside proven SS1 performance.
Street Manners with Strong PD Blower Performance
Designed for real street cars with minimal supporting modifications, this cam offers:
- Stable idle around 675 RPM
- Stock torque converter compatibility
- Smooth, quiet lobe design for reduced valvetrain noise
- Strong off-idle torque pulling to ~6600 RPM
Quick Specs
- Part Number: SC-STG1-8620
- Application: LSA / LS9 / positive displacement blown LS engines
- Cam Type: High lift blower camshaft
- Core Material: 8620 alloy hardened core
- Valve Springs: Dual .660" required
- Pushrods: Hardened pushrods required
- AFM / DoD: Delete required
- Converter: Works with stock torque converter
- Idle Speed: Approx. 675 RPM
- RPM Range: Very strong from off idle to ~6600 RPM
- Intended Build: Mild-to-moderate PD supercharged street applications
Features & Benefits
- Premium 8620 hardened core for superior durability under boost
- High lift profile designed for PD blower efficiency
- Stock converter friendly with excellent street manners
- Improved wear resistance on cam lobes for long-term reliability
- Strong torque curve ideal for real-world street performance
- Smooth valvetrain operation for quiet, dependable performance
FAQs
Is the 8620 hardened core worth upgrading to?
Yes. The 8620 hardening process significantly improves lobe wear resistance and overall cam strength, making it a superior choice for any PD supercharged LS build seeking maximum longevity.
Can I still run this cam with a stock torque converter?
Absolutely. The LS SS1 Blower with 8620 upgrade maintains the same stock-converter-friendly characteristics, stable idle, and strong low-end response as the standard SS1 camshaft.
Why Buy from Beefcake Racing?
Beefcake Racing provides LSA, LS9, and LS performance expertise backed by real-world blower setups and proven results. Whether you're selecting a cam or building a complete package, our team can help you get the most out of your supercharged LS combination.
Call 1-855-827-7223 or email sales@beefcakeracing.com for expert support.
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