GPI L83 / L84 (5.3L) DI Truck High Lift Cams - STG3 (2014 GMC Sierra 1500 5.3L / Chevy Silverado) - L83HL3
Stage 3 High Lift Camshaft for Maximum 5.3L DI Truck Performance
The GPI L83HL3 is the most aggressive camshaft in the L83/L84 High Lift series - engineered for hardcore truck enthusiasts who want maximum horsepower, stronger midrange punch, and exceptional upper-RPM performance. Designed specifically for the 2014+ 5.3L Direct Injected GM truck platform, this cam delivers the strongest torque and horsepower gains of the STG1 - STG3 lineup.
With improved airflow, sharper throttle response, and a powerful pull all the way to 6600 RPM, the L83HL3 is ideal for highly spirited street/strip trucks and performance-minded builds that plan to use a higher stall converter and upgraded supporting mods.
High Lift Valvetrain Requirements
As a true high lift LT truck cam, proper valvetrain upgrades are mandatory:
- Dual .660? valve springs required
- GPI 0° Phaser Limiter required
- No head milling without verifying piston-to-valve clearance
- Flycutting may be required depending on head setup and timing
The L83 platform has tighter piston design than the LT1 and L86, making PTV checking critical before installation.
High Lift Cam Advantage - NA & Centrifugal Blower Friendly
Although originally designed for naturally aspirated applications, centrifugal superchargers maintain a similar power curve - allowing the L83HL3 to perform extremely well in boosted builds. If you're NA today but planning boost later, this cam is an excellent long-term choice.
Stage 3 Cam Specs - L83HL3
- Duration (Int/Exh): 219 / 231
- Valve Lift (Int/Exh): .630 / .630
- LSA: 114
- ICL: +4
Performance Characteristics
- Strongest torque & horsepower in the STG1 - STG3 lineup
- Hard pull to 6600 RPM with increased top-end efficiency
- Requires upgraded torque converter
- Excellent for street/strip and aggressive performance builds
- Pairs very well with centrifugal superchargers
- Requires GPI 0° Phaser Limiter
Quick Specs
- Engine: 5.3L L83 / L84
- Cam Type: High lift DI truck cam
- Duration: 219 / 231
- Lift: .630 / .630
- LSA / ICL: 114 / +4
- RPM Capability: Very strong to 6600 RPM
- Converter: Upgraded converter required
- Phaser Limiter: GPI 0° required
- Milling: Not recommended without PTV check
- Flycutting: May be 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
Do I need a stall converter for the L83HL3?
Yes. The STG3 cam requires an upgraded torque converter to perform correctly and maintain drivability.
Is this cam safe for stock pistons?
Yes, but PTV clearance must be checked. The L83 piston design has reduced clearance, and flycutting may be required depending on your head setup.
Why Buy from Beefcake Racing?
Beefcake Racing delivers expert support, fast shipping, and proven experience with LT and DI truck performance. Whether you're planning a street-friendly upgrade or a full-tilt performance build, our team ensures you get the right cam, springs, limiter, and supporting parts for your goals.
Call 1-855-827-7223 or email sales@beefcakeracing.com.
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