Description
A ring compressor is essential when assembling or rebuilding any engine—it safely compresses piston rings during installation, preventing damage to both rings and cylinder walls. The ARP 4.040 Tapered Ring Compressor is precision-engineered from billet aluminum and designed for 4.040″ bore engines, making it an indispensable tool for any serious builder tackling small-block or mid-sized applications. Its tapered design ensures consistent compression across all ring positions while the black anodized finish resists corrosion in the shop environment.
- 4.040″ bore diameter
- Billet aluminum construction
- Tapered design
- Black anodized finish
- Single unit
- Sold individually






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