GPI - LS3 Camshaft - Thump '24 with 8620 Hardened Core Upgrade - 8620-LS-Thump-24
Enhanced Thump '24 Cam with Premium 8620 Hardened Core
The GPI Thump '24 LS3 Camshaft with 8620 Hardened Core Upgrade takes one of the most proven LS camshafts on the market and elevates its durability even further. Built for LS3, LS2, and LS1 engines using 3-bolt cam hardware, this upgraded core delivers superior strength under aggressive valve spring pressures - ideal for high-RPM street/strip builds and long-term reliability.
Known nationwide as a benchmark choice for Camaros and Corvettes, the Thump '24 series is a favorite among LS enthusiasts seeking exceptional power gains and unmistakable cam sound. GPI cam and head packages using this profile have consistently pushed customers into the 10-second quarter mile range, proving their real-world performance.
Natural Aspirated or Centrifugal Boost - Both Work Beautifully
Although designed with N/A LS engines in mind, the Thump '24's characteristics translate seamlessly to centrifugal supercharged setups. Because centrifugal blowers follow a more linear power curve similar to naturally aspirated builds, this cam delivers excellent top-end power whether you're N/A now or planning boost later.
Four Cam Variants for Any LS Build
This popular camshaft family comes in four different iterations, allowing LS owners to choose the ideal grind - from a milder performance cam with near-stock manners, to an aggressive all-out N/A race profile. No matter which version you select, the 8620 hardened core ensures maximum durability under high spring load.
Installation Requirements
Like all Thump '24 cams, this is a high-lift 3-bolt design. Proper supporting valvetrain is critical for safe operation. Installation requires:
- Dual .660" valve springs
- Hardened pushrods
- 3-bolt cam conversion if replacing a factory single-bolt cam
Refer to the Cam Install Package above for recommended hardware and supporting components.
Features
- Upgraded 8620 hardened core for exceptional durability under high spring pressures
- Pound-for-pound one of the best 3-bolt LS3/LS2/LS1 cams available
- Proven benchmark cam for Camaros and Corvettes nationwide
- Four iterations available: mild street to aggressive all-out N/A
- Excellent choice for both N/A and centrifugal-supercharged combinations
- Known for strong top-end power, aggressive tone, and real-world track results
- GPI camshaft and head packages have pushed customers into the 10s
Quick Specs
- Part Number: 8620-LS-Thump-24
- Engine Platforms: LS3 / LS2 / LS1
- Core Upgrade: Premium 8620 hardened cam core
- Cam Style: High-lift 3-bolt LS camshaft family
- Performance Range: Four options from street-friendly to all-out N/A race
- Boost Compatibility: Works exceptionally with centrifugal superchargers
- Required Components: Dual .660" valve springs, hardened pushrods, 3-bolt conversion
FAQs
What is the benefit of the 8620 hardened core upgrade?
The 8620 core provides increased strength and wear resistance, making it ideal for high-lift camshafts using dual valve springs, especially in high-RPM or long-term performance applications.
Is this camshaft suitable for boosted LS builds?
Yes. While optimized for naturally aspirated engines, the Thump '24 profile works extremely well with centrifugal superchargers, offering excellent top-end efficiency and smooth power delivery.
Why Buy from Beefcake Racing?
Beefcake Racing is your go-to source for late-model GM performance, offering expert recommendations and fast shipping on GPI camshafts and supporting valvetrain components. Need help choosing the ideal Thump '24 variant?
Call 1-855-827-7223 or email sales@beefcakeracing.com.
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