Holley adjustable needle and seat assembly with a 0.150″ steel seat. The larger seat supports higher fuel demand, and the adjustable design makes setting float level quick and precise.
- Adjustable needle & seat, 0.150″ steel seat
- High fuel-flow capacity
- Holley 4150/4160-style carburetors



![Mastodon 600CFM Carburetor [Holley-Style]](https://allamericanmuscle.co.za/wp-content/uploads/2026/06/4259834_L1600_3ea06578-2502-4c18-9b13-d712b09702c0-300x300.webp)


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