Product Description
BTR Piston Ring Compressor – 3.903" Bore Size
Make piston installation fast, precise, and stress-free with BTR 3.903" Aluminum Tapered Ring Compressor. Designed for precision engine assembly, this one-piece compressor eliminates the frustration of damaged rings or misalignment during installation.
Unlike traditional designs, the BTR ring compressor features a reverse chamfer at the base that fits perfectly into the chamfer at the top of the block. This ensures exact centering over the bore and reduces the risk of the oil ring getting caught between the compressor and top of the block, a common issue with generic tools.
Key Features:
- Perfect Fit for Oversized Bores: Designed specifically for .005" oversized cylinders (3.903" bore in place of a factory 3.898").
- Precision Alignment: Reverse chamfer centers the compressor over the bore for smooth, consistent piston installation.
- Prevents Ring Damage: Keeps the oil ring from snagging during installation.
- Durable Construction: Machined from solid aluminum and black anodized for long-lasting use.
- Laser-Etched Markings: Easy-to-read size identification that won't fade over time.
Applications:
- Commonly used with 5.7L LS1/LS6 engines that have been honed or bored .005" over.
- Ideal for performance builds, rebuilds, and precision engine assembly.
Note: The 3.903" ring compressor is intended for .005" oversized cylinders and should not be used with factory stock 3.898" bore engines.
