GPI LSA / LS9 / LS PD Blower Camshaft - LS SS3 Blower with 8620 Hardened Core Upgrade - SC-STG3-8620
Maximum-Effort Street/Strip Blower Cam with 8620 Hardened Core
The GPI LS SS3 Blower - 8620 Hardened Core Upgrade is the ultimate camshaft for LSA, LS9, and other positive displacement supercharged Gen IV LS engines, offering the highest torque and horsepower gains in the SS blower lineup. This upgraded version features a premium 8620 hardened alloy core, engineered for enhanced durability, superior wear resistance, and long-term reliability under the extreme loads of PD blower applications.
As a high lift camshaft, it requires proper valvetrain support, including dual .660" valve springs, hardened pushrods, and an AFM/DoD delete. With a 3600+ RPM stall converter and 3.91 gearing, the SS3 is a proven performer - delivering brutal acceleration, strong midrange, and exceptional stability up to 6900 RPM.
Why Choose the 8620 Hardened Core?
The 8620 alloy upgrade undergoes a specialized hardening process that greatly improves camshaft strength and longevity without sacrificing the ductility that makes this alloy so effective. Benefits include:
- More durable lobe wear surfaces for long-term reliability
- Improved material strength to withstand blower load and pressure
- Superior high-RPM durability compared to standard cam cores
- Ideal for aggressive, high-boost street/strip applications
If you want the strongest, most reliable version of GPI's hardest-hitting blower cam, the 8620 SS3 is the clear choice.
Hardcore Street/Strip Performance
The SS3 Blower cam is engineered for enthusiasts who demand maximum output without stepping into full-race-only territory. It produces more torque and horsepower than both the SS1 and SS2 grinds, and is optimized for positive displacement blower efficiency.
- Extremely strong to ~6900 RPM
- 3600+ stall converter required
- Thrives on 3.91 rear gearing
- Track tested, developed, and proven in competitive environments
Proven GPI Engineering
GPI camshafts have earned a dominant reputation across the country, especially in PD blower platforms. Their cam and head packages continually set records and win races, thanks to precise design and real-world testing. The SS3 sits at the top of this proven lineup, offering the hardest hit and broadest powerband available.
This camshaft is ideal for vehicles such as the ZL1, CTS-V, ZR1, and other Gen IV LS platforms equipped with positive displacement superchargers.
SS3 Blower Cam Specs - SC-STG3-8620
- Duration (Int/Exh): 230 / 251
- Valve Lift (Int/Exh): .646 / .637
- LSA: 118
- ICL: +6.5
- RPM Range: Extremely strong to ~6900 RPM
- Converter: 3600+ stall required
- Rear Gear Ratio: Best matched with 3.91 gearing
- Core Material: 8620 hardened alloy
Quick Specs
- Application: LSA / LS9 / PD supercharged LS engines
- Duration: 230 / 251
- Lift: .646 / .637
- LSA / ICL: 118 / +6.5
- Converter: 3600+ RPM
- RPM Capability: ~6900 RPM
- Rear Gearing: Thrives with 3.91 gears
- Valvetrain: Dual .660" springs & hardened pushrods
- AFM/DoD: Delete required
- Core: 8620 hardened upgrade
Features & Benefits
- Most powerful cam in the SS blower series
- Superior wear resistance from the 8620 hardened core
- Optimized for PD blowers like LSA & LS9
- Strong to ~6900 RPM with proper support
- Ideal for hardcore street/strip applications
- Engineered for ZL1, CTS-V, ZR1 and similar platforms
FAQs
Is the 8620 hardened core beneficial for high-boost PD blower setups?
Yes. The 8620 hardened core significantly improves lobe wear resistance and material strength, making it the ideal choice for aggressive, high-boost, or high-mileage PD supercharged builds.
What supporting components do I need to run the SS3 Blower cam?
This high lift cam requires dual .660" valve springs, hardened pushrods, and an AFM/DoD delete. A 3600+ stall converter is required, and 3.91 gears are strongly recommended.
Why Buy from Beefcake Racing?
Beefcake Racing specializes in supercharged LS performance and carries the full GPI cam lineup. Whether you're building a record-chasing track car or an extreme street setup, our team offers the expertise and support to help you choose the perfect camshaft.
Call 1-855-827-7223 or email sales@beefcakeracing.com.
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