GPI High Lift LS Camshaft for GM Trucks - 8620 Hardened Core (4.8L / 5.3L / 6.0L / 6.2L) - HLT4-8620
Ultimate High-Lift Performance Camshaft with 8620 Core
The GPI HLT4-8620 High Lift LS Camshaft is the most aggressive cam in GPI's truck lineup - now enhanced with the 8620 hardened core upgrade for superior durability, strength, and long-term valvetrain stability. Designed for drivers who want maximum performance from their Silverado, Sierra, Tahoe, Yukon, Suburban, Avalanche, or LS-swapped hot rod, the HLT4 delivers the signature big-cam idle and strong high-RPM power demanded by serious enthusiasts.
With a powerband that comes alive at 3,250 RPM and up, this camshaft is ideal for street/strip and race-oriented builds. While compatible with stock bottom-end engines, the HLT4-8620 truly shines when paired with high-flow intakes, long-tube headers, and deeper rear axle gearing. A stall converter and headers are required for proper operation.
Why Choose the 8620 Hardened Core?
GPI's 8620 heat-treating process hardens the camshaft lobes, creating an extremely durable wear surface while preserving the alloy's ductile core. The result is a camshaft that handles aggressive spring pressures and high-RPM abuse with ease - perfect for trucks that are driven hard.
High Lift Performance Series Overview
The HLT3 and HLT4 series represent GPI's most performance-oriented truck cams. These grinds are extremely versatile, offering a big, unmistakable camshaft idle and strong RPM capability while remaining compatible with stock displacement LS truck engines. When combined with upgraded airflow and drivetrain components, these cams deliver exceptional gains.
Cam Specs - HLT4-8620
- Part Number: HLT4-8620
- Duration (Int/Exh): 224 / 232
- Lift (Int/Exh): .629 / .629
- LSA: 111
- ICL: +3.5
- RPM Range: 3,250+ RPM
- Converter Required: Yes
- Headers Required: Yes
- Core Material: 8620 Hardened Steel
Performance Highlights
- Most aggressive cam in GPI's High Lift Performance lineup
- Upgraded 8620 hardened core for top-tier durability
- Big cam idle with strong mid-range and high-RPM capability
- Ideal for street/strip and race builds
- Significant gains with high-flow intake/exhaust and steeper gears
Quick Specs
- Part Number: HLT4-8620
- Fitment: 4.8L / 5.3L / 6.0L / 6.2L LS Engines
- Idle Quality: Aggressive, big-cam
- Required Mods: Stall converter, headers
- Recommended Mods: High-flow intake/exhaust, gears
- Core Type: 8620 Hardened
Fitment
- Chevrolet Silverado (4.8L / 5.3L / 6.0L / 6.2L)
- GMC Sierra (4.8L / 5.3L / 6.0L / 6.2L)
- Chevrolet Tahoe
- Chevrolet Suburban
- GMC Yukon / Yukon XL
- Chevrolet Avalanche
- LS-swapped hot rods & custom street rods
FAQs
What benefits does the 8620 hardened core provide?
It dramatically increases lobe durability, making it ideal for aggressive valve springs, high RPM, and long-term reliability under performance use.
Is a converter required for the HLT4-8620?
Yes. A high-stall converter and long-tube headers are mandatory for proper performance and drivability.
Why Buy from Beefcake Racing?
We offer expert tech support, fast shipping, and the best pricing on all GPI camshafts.
Call 1-855-827-7223 or email sales@beefcakeracing.com.
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