BTR Gen III & IV LS Truck Norris NSR (No Springs Required) Cam BTR-TRUCKNORRIS-NSR
Specs: 212/22X, .498"/.498", 107° LSA
Overview
Developed from the success of the original Truck Norris, this NSR (No Springs Required) camshaft will deliver a roundhouse kick in the pants to your 1999-2013 Silverado or Sierra. Developed from hundreds of hours of in house cam lobe design and dyno testing, this camshaft has more power and torque everywhere in the curve compared to our legendary V2 truck cams.
Specifications
BTR SKU: BTR-TRUCKNORRIS-NSR
Camshaft Description: BTR Gen III & IV Truck Norris NSR Camshaft
Engine Family: Gen III & IV LS Applications
Recommended Engine Size: 4.8 – 6.2 L
Valve Spring Requirement: Not Required (NSR design)
Recommended Lifters & Trays: (LS7 Lifters) X12499225 | (Trays) BTR95365-4
Suggested Pushrod Length: 7.400” (stock length compatible)
Camshaft Data
| Specification | Value |
|---|---|
| Intake Duration @ .050" | 212° |
| Exhaust Duration @ .050" | 22X° |
| Lift (Intake / Exhaust) | .498" / .498" |
| Lobe Separation Angle | 107° |
| RPM Operating Range | 1400 – 6200 |
| Idle Quality | Rowdy but manageable – classic Truck Norris sound |
| Chop Scale | 5 / 10 |
| Torque Converter Compatibility | Works with OE converter |
| Drivability | Excellent – great for daily drivers and tow rigs |
Performance Highlights
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NSR design—no spring upgrade needed
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Increases low- and mid-range torque for better pulling power
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Delivers a signature Truck Norris idle tone with strong top-end power
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Perfect for bolt-on trucks wanting real gains without added complexity
