ARP 900-0950 4.095 Bore Ring Compressor | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Features:

• Fits 4.095 inch bore engine builds
• True radius design ensures smooth installation
• CNC-machined from 6061-T6 billet aluminum
• Preferred by professional engine builders
• Relieved bottom allows wire O-ring clearance
• Type 3 anodized for long-lasting durability
• Reduces ring damage during piston installation
• Provides consistent pressure across ring pack
• Clearly engraved size for quick identification
• Ideal for high-performance or rebuild applications
• Reusable for multiple engine assembly projects
• Engineered for precision and repeatable results

Take The Struggle Out Of Your Next Engine Build

If you’ve ever tried installing pistons without the right ring compressor, you know how quickly things can go sideways. The ARP 900-0950 4.095 Bore Ring Compressor is built to keep that frustration off your bench and make the job smoother from the start. Designed with serious builders in mind, this tool gives you the confidence to install pistons cleanly and consistently, whether you're working on a street build or prepping a race motor. The fit is precise, the feel is solid, and the results speak for themselves. No more fumbling with cheap, tapered tools that jam up or risk damaging rings. This compressor gets it right the first time, saving you time, hassle, and potential rework. It’s the kind of investment that pays for itself the moment you slide that first piston in like it’s on rails.

Designed For Builders Who Expect Perfect Fit Every Time

The ARP 900-0950 ring compressor is engineered for precision and repeatability, offering a perfect fit for engines with a 4.095 inch bore. Crafted from 6061-T6 billet aluminum and CNC-machined to exact tolerances, it uses a true radius design that evenly compresses piston rings without pinching or distortion. This design provides superior alignment compared to standard tapered compressors, reducing the risk of installation errors that can lead to performance issues down the line. The bottom of the tool is relieved to accommodate wire O-rings, making it especially useful in builds where sealing and fitment are critical. A Type 3 anodized finish enhances the durability of the tool, keeping it resistant to wear and corrosion even with regular shop use. Each unit is clearly marked with 3/4 inch engraved sizing, so there's no second guessing when you’re organizing for a busy build. Whether you’re working on a full rebuild or fine-tuning a performance engine, this tool delivers accuracy you can rely on with every piston you drop in.

Fits: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Notes:

• Designed for engines with a 4.095 inch bore
• Ideal for 2001-2016 GM 6.6L Duramax applications
• Features true radius design for better alignment
• Not compatible with tapered-style ring compressors
• CNC-machined from high-strength 6061-T6 billet aluminum
• Bottom relief allows clearance for wire O-rings
• Type 3 anodized for wear and corrosion resistance
• Bore size engraved in large 3/4 inch numbers
• Commonly used by professional engine builders
• ARP products are non-returnable if packaging is opened