---
title: How can I verify that my Tuner Stage 1 camshafts are authentic Skunk2?
description: Tuner Stage 1 camshafts will be hand-etched on the distributor end. They will be marked with H01 on both camshafts. Newer Tuner Stage 1 camshafts will also have S2 cast into the camshaft core in betwe
---

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1. [Skunk2, Grams Performance and Karftwerks](https://knowledge.skunk2.com/migration/en/knowledge?hsLang=en)
2. [Skunk2](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en)
3. [Camshaft - Tuner Series](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#camshaft-tuner-series)

# How can I verify that my Tuner Stage 1 camshafts are authentic Skunk2?

Tuner Stage 1 camshafts will be hand-etched on the distributor end. They will be marked with H01 on both camshafts. Newer Tuner Stage 1 camshafts will also have S2 cast into the camshaft core in between the lobes.

- [General](https://knowledge.skunk2.com/migration/en/knowledge/general?hsLang=en)
- [Skunk2](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#main-content)

    - [General](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#general)
    - [Camshaft - General](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#camshaft-general)
    - [Camshaft - Pro Series](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#camshaft-pro-series)
    - [Camshaft - Tuner Series](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#camshaft-tuner-series)
    - [Camshaft - Ultra Series](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#camshaft-ultra-series)
    - [Camshaft - BMF Series](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#camshaft-bmf-series)
    - [Engine](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#engine)
    - [Exhaust](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#exhaust)
    - [Induction / Throttle Bodies](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#induction-throttle-bodies)
    - [Suspension](https://knowledge.skunk2.com/migration/en/knowledge/skunk2?hsLang=en#suspension)
- [Kraftwerks](https://knowledge.skunk2.com/migration/en/knowledge/kraftwerks?hsLang=en)
- [Grams Performance](https://knowledge.skunk2.com/migration/en/knowledge/grams-performance?hsLang=en)

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