BTR Brian Tooley Racing 3.903" Piston Ring Compressor | Fits LS1 & LS-Based 383 Engines | CNC-Machined Billet Aluminum | Tapered Design for Smooth Piston Installation

The Brian Tooley Racing (BTR) 3.903" Piston Ring Compressor is a precision-engineered tool built for professional engine builders and LS enthusiasts alike. Designed specifically for LS1 and LS-based 383 stroker engines, this CNC-machined billet aluminum ring compressor provides a fast, smooth, and damage-free way to install pistons into the cylinder bores. With its tapered inner design, the tool gently compresses piston rings for easy, one-motion installation—preventing broken rings or scratched cylinder walls. Each compressor is anodized for corrosion resistance and long-lasting durability, ensuring it holds up to repeated shop or garage use. Whether you're assembling a performance LS build or completing a full engine rebuild, the BTR 3.903" Piston Ring Compressor delivers professional-grade precision and reliability—a must-have in every builder’s toolkit.

• Precision CNC-Machined Billet Aluminum – Crafted from high-strength aluminum and precision-cut for exact ring compression and long-term durability in high-volume engine builds.
• 3.903" Bore Size for LS Applications – Specifically designed for LS1 and LS-based 383 stroker engines, providing a perfect fit for standard and aftermarket performance pistons.
• Tapered Inner Design for Easy Installation – Smoothly guides the piston and rings into the bore without catching or damaging ring edges, ensuring quick and safe assembly.
• Anodized Finish for Longevity – Corrosion-resistant surface stands up to oils, solvents, and repeated use in professional or home engine shops.
• Trusted BTR Quality & Performance – Backed by Brian Tooley Racing’s industry-leading engineering, trusted by top LS engine builders worldwide for precision tools and performance components.