Victor 41850CP Plasma-Moly Piston Ring Set 3.898 in. Bore V8

The Victor 41850CP is a premium plasma-moly piston ring set designed for V8 engines with a 3.898-inch (99.009mm) standard bore. Featuring a 1.5mm / 1.5mm / 3.0mm ring thickness configuration, this set is a precision drop-in replacement that requires no file fitting and is engineered for long service life under demanding conditions.

Key Features:

• Plasma-moly top compression ring — carbon steel construction with plasma-moly facing for superior wear resistance under high-stress, severe operating conditions
• Napier (taper hooked groove) second ring — cast iron with reverse twist design for enhanced groove side sealing and improved compression control
• CP-20 oil control ring assembly — stainless steel construction with a 20-degree ear angle for optimal side sealing against the cylinder wall; chemically polished expander promotes enhanced oil drainback
• No file fitting required — precision-ground rings are ready to install straight out of the box
• Standard tension oil ring — balanced oil control without excess friction
• SAE 9254 high-alloy steel — provides superior tensile strength, fatigue resistance, and material hardness
• Barrel-faced contact area with CNC-controlled gap chamfer optimizes compression and reduces blow-by
• Legal for sale and use in all 50 states

Specifications:

• Bore Diameter: 3.898 in. (99.009mm) — Standard
• Top Ring: 1.5mm thickness | Carbon Steel | Plasma-Moly Facing | Type: RF-13PF
• Second Ring: 1.5mm thickness | Cast Iron | Iron Facing | Type: THM-10
• Oil Control Ring: 3.0mm thickness | Stainless Steel | Type: CP-20
• File Fit: No
• Gapless: No
• Gas Ported: No

This piston ring set delivers better stress resistance, reduced groove poundout, less side wear, superior oil economy, improved blow-by control, lower friction, and better cylinder wall conformability — making it an ideal choice for engine rebuilds and performance applications.