Description
Piston ring quality directly impacts compression, oil control, and engine longevity—especially in high-demand racing and performance applications. The Speed Pro 4.040 ring set delivers low-tension design with plasma moly coating for reduced friction, extended ring life, and consistent blow-by control across the entire RPM range. File-fit construction ensures precise bore compatibility and reliable sealing when properly installed.
- Bore diameter: 4.040″
- Ring thickness: 1/16 x 1/16 x 3/16″
- Tension: Low
- Coating: Plasma moly
- Material: High-grade steel
- Fit type: File fit
- Application: 8-cylinder engines
- Configuration: Complete ring kit
- MPN: R940145
- Installation: Professional honing recommended
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