GPI LS3 Camshaft - LS SS1 with 8620 Hardened Core Upgrade - SS1-8620
SS1 Camshaft Performance with the Strength of an 8620 Hardened Core
The GPI LS SS1 Camshaft with 8620 Hardened Core Upgrade delivers the same legendary performance that made the SS1 a benchmark cam for LS3, LS2, and LS1 engines - now built on an ultra-durable 8620 steel core for enhanced longevity under high spring pressures. This upgrade is ideal for builders who want maximum reliability without sacrificing drivability or power.
Designed for minimally modified vehicles, the SS1 provides a stable 675 RPM idle, excellent low-end torque, and a smooth, quiet lobe design that promotes long-term valvetrain stability. With a powerband that pulls strongly from off idle to 6600 RPM, this cam is perfect for daily-driven LS cars that still want real performance.
A Proven Winner in Real Racing Environments
GPI cam and head packages featuring the SS-series grinds have been dominating tracks nationwide, pushing customer Camaros and Corvettes deep into the 10-second range. The SS1 is known for delivering impressive gains while maintaining exceptional street manners - which is exactly why it remains one of GPI's most popular camshafts.
Naturally Aspirated or Centrifugal Boost Compatible
Though designed for N/A engines, the SS1 works seamlessly with centrifugal superchargers due to the similar linear power curve. If you're running naturally aspirated now but considering boost later, this cam is an excellent foundation that won't require compromise.
Four SS-Series Cam Variants
The SS-Series lineup includes four versions, ranging from mild to aggressive N/A race profiles. The SS1 is the mildest in the family, making it ideal for lightly modified street cars that need strong low-end response and reliable drivability.
Installation Requirements
This is a high-lift, 3-bolt LS camshaft. Proper supporting hardware is required:
- Dual .660" valve springs
- Hardened pushrods
- 3-bolt cam conversion for engines originally using a single-bolt cam
For recommended components, refer to the Cam Install Package above.
Camshaft Specs
- Duration (Intake/Exhaust): 224 / 237
- Valve Lift (Intake/Exhaust): .646" / .637"
- LSA: 112
- ICL: +4
- Idle RPM: Stable around 675 RPM
- RPM Range: Off idle to 6600 RPM
Features
- Built on a durable 8620 hardened steel core for superior strength
- Pound-for-pound one of the best LS3/LS2/LS1 cams available
- Excellent low-end torque and stable idle for daily-driven vehicles
- S smooth, quiet lobe design enhances valvetrain life
- Ideal for cars with minimal modifications
- Exceptional performance in both N/A and centrifugal blower setups
- Part of a 4-cam family with options from mild to all-out N/A race
Quick Specs
- Part Number: SS1-8620
- Platform: LS3 / LS2 / LS1
- Core Type: 8620 Hardened Steel
- Cam Type: High-lift, 3-bolt
- Idle Quality: Smooth ~675 RPM
- RPM Range: Off idle to 6600 RPM
- Manners: Mild street profile with strong torque
- Required Hardware: Dual .660 springs, hardened pushrods, 3-bolt conversion
FAQs
What benefits does the 8620 hardened core offer?
The 8620 core provides significantly increased strength and wear resistance, making it ideal for high-lift cams running aggressive valve spring pressures. It ensures long-term durability and quiet operation.
Is the SS1 still street-friendly with the core upgrade?
Yes. The hardened core does not change the cam's behavior - only its durability. The SS1 still idles smoothly, works well with a stock torque converter, and delivers excellent low-end torque for daily street use.
Why Buy from Beefcake Racing?
Beefcake Racing provides expert guidance, competitive pricing, and fast shipping on GPI camshafts and LS valvetrain components. Need help selecting the right SS-series cam or supporting hardware?
Call 1-855-827-7223 or email sales@beefcakeracing.com.
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