GPI LS3 Camshaft - LS SS4 (No Flycut) with 8620 Hardened Core Upgrade - SS4NFC-8620
All-Out N/A Performance with 8620 Hardened Core Durability
The GPI LS SS4 (No Flycut) Camshaft with 8620 Hardened Core Upgrade delivers the most aggressive naturally aspirated performance available in the SS-Series - while still clearing stock LS3/LS2/LS1 heads and factory gaskets with zero piston flycutting. The upgraded 8620 hardened steel core dramatically increases durability under high spring loads, making this the ideal choice for high-RPM, track-focused builds that demand maximum reliability.
Designed for serious performance enthusiasts, the SS4NFC-8620 remains streetable but requires a 4000+ RPM torque converter and performs best with 3.91 - 4.10 rear gearing. With the right supporting mods, this camshaft is capable of 10-second quarter-mile performance and pulls extremely hard all the way to 7200 RPM.
Track-Tested, Developed & Proven
As with all SS-Series profiles, the SS4NFC-8620 has been extensively tested and refined through real racing environments. GPI Camshaft and Head Packages featuring this grind have been dominating tracks nationwide, pushing countless Camaros and Corvettes deep into the 10-second range. It's the top-tier choice for anyone wanting all-out naturally aspirated power without piston modification.
Engineered for N/A but Exceptional with Centrifugal Boost
While optimized for naturally aspirated LS builds, the SS4NFC-8620 also performs extremely well with centrifugal superchargers. Its high-RPM, airflow-focused design aligns perfectly with the linear boost curve of centrifugal blowers, making it an excellent long-term cam for builders planning to add boost later.
Four SS-Series Options to Match Your Build
The SS-Series includes four progressively aggressive cam profiles. The SS4NFC-8620 sits at the top of the street/strip category - more aggressive than the SS1, SS2, and SS3 - yet still safe for stock heads without milling or flycutting.
Installation Requirements
This is a high-lift, 3-bolt LS camshaft and requires the correct valvetrain support:
- Dual .660" valve springs
- Hardened pushrods
- 3-bolt cam conversion for engines that originally used a single-bolt cam
- Torque Converter: 4000+ RPM required
- Rear Gearing: Prefers 3.91 - 4.10
This profile was specifically engineered to clear stock heads and factory gaskets with no milling or piston flycutting.
Camshaft Specs
- Duration (Intake/Exhaust): 236 / 252
- Valve Lift (Intake/Exhaust): .646" / .637"
- LSA: 113
- ICL: +4
- RPM Range: Strong to 7200 RPM
- Flycutting Required: No
- Converter Requirement: 4000+ RPM
- Recommended Rear Gearing: 3.91 - 4.10
Features
- Premium 8620 hardened core dramatically improves durability
- Most aggressive SS-Series cam that requires no piston flycutting
- Track-tested and proven 10-second performance capability
- Pulls extremely hard to 7200 RPM
- Ideal for high-compression N/A or centrifugal blower setups
- Very streetable for its performance class with correct converter
- Designed to clear on stock heads and gaskets without milling
Quick Specs
- Part Number: SS4NFC-8620
- Engine Platforms: LS3 / LS2 / LS1
- Core Type: 8620 Hardened Steel
- Cam Type: High-lift 3-bolt
- Top-End Power: Up to 7200 RPM
- Street/Strip Classification: All-out N/A performance
- Flycutting: Not required
- Required Hardware: Dual .660 springs, hardened pushrods, 3-bolt conversion
- Recommended Converter/Gearing: 4000+ RPM, 3.91 - 4.10 gears
FAQs
Does the 8620 core affect how the SS4 NFC performs?
No. The 8620 core upgrade only increases durability. The aggressive performance profile of the SS4 NFC remains unchanged, delivering the same high-RPM and top-end power characteristics.
Is the SS4NFC-8620 safe to run on stock pistons?
Yes. This camshaft is specifically engineered to clear stock heads and factory gaskets without milling or flycutting, making it one of the most powerful no-flycut options available.
Why Buy from Beefcake Racing?
Beefcake Racing provides expert recommendations, competitive pricing, and fast shipping on GPI camshafts and LS valvetrain components. Need help selecting the right SS-Series cam for your setup?
Call 1-855-827-7223 or email sales@beefcakeracing.com.
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