L83 / L84 (5.3L) DI Truck High Lift Cams - STG4 (2014 GMC Sierra 1500 5.3L / Chevy Silverado) - L83HL4
Stage 4 High Lift Camshaft for Maximum 5.3L DI Truck Power
The L83HL4 is the most aggressive high lift camshaft available for the L83 / L84 5.3L Direct Injected GM truck platform. Designed for all-out power, this cam targets the enthusiast who wants to extract every ounce of performance from their naturally aspirated or centrifugal-supercharged 5.3L build. It delivers massive airflow, excellent torque gains, and exceptional top-end power while still remaining surprisingly street-capable with the correct converter and supporting mods.
Like all GPI high lift cams, the STG4 benefits from a refined, quiet lobe design for long-term reliability and smooth valvetrain operation - even at elevated RPM levels. If you want the strongest cam in the lineup, this is it.
High Lift Valvetrain Requirements
As a true high lift LT camshaft, the STG4 requires proper supporting components for durability and safe operation:
- Dual .660? valve springs required
- GPI 4° Phaser Limiter required
- No cylinder head milling without first verifying piston-to-valve clearance
- Flycutting required due to reduced L83 piston clearance
Excellent for NA or Centrifugal Blower Builds
Although this cam was originally created for naturally aspirated engines, the nearly identical power curve of centrifugal superchargers makes the L83HL4 a perfect match for blower applications. This makes it an ideal choice for truck owners who intend to add boost in the future.
Stage 4 Cam Specs - L83HL4
- Duration (Int/Exh): 223 / 235
- Valve Lift (Int/Exh): .630 / .630
- LSA: 114
- ICL: +8
Performance Characteristics
- Strongest 5.3L DI truck cam in the entire GPI lineup
- Requires 4000+ stall converter for proper drivability
- Flycutting required due to tight piston-to-valve clearance
- Extremely strong to 6800 RPM
- Designed specifically for use with the GPI 4° Phaser Limiter
- Ideal for maximum-effort street/strip and high-performance builds
Quick Specs
- Engine: 5.3L L83 / L84
- Cam Type: High lift DI truck camshaft
- Duration: 223 / 235
- Lift: .630 / .630
- LSA / ICL: 114 / +8
- RPM Capability: Strong to 6800 RPM
- Converter: 4000+ stall required
- Phaser Limiter: GPI 4° required
- Milling: Not allowed without PTV check
- Flycutting: Required
Fitment
Chevrolet Silverado 1500 - 5.3L
- 2014 Chevrolet Silverado 1500 5.3L
GMC Sierra 1500 - 5.3L
- 2014 GMC Sierra 1500 5.3L
FAQs
Is a torque converter required for the STG4 cam?
Yes. This camshaft requires a 4000+ stall converter to operate properly and maintain good street characteristics.
Do I need to flycut the pistons?
Yes. Because the L83 piston offers limited clearance, the STG4 requires flycutting to ensure safe piston-to-valve clearance.
Why Buy from Beefcake Racing?
Beefcake Racing is your trusted source for late-model GM truck performance. From camshafts to phaser limiters and valve springs, we supply everything you need for a correct, reliable installation. Our team provides expert guidance to ensure you choose the right cam for your goals.
Call 1-855-827-7223 or email sales@beefcakeracing.com.
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