Speedmaster DNA Billet Black Oxide SFI Flexplate for Oldsmobile 400 425 455 2PC RMS 166 Tooth

The Speedmaster DNA Billet Black Oxide SFI Flexplate is a premium two-piece rotating mass system (RMS) designed for Oldsmobile 400, 425, and 455 big-block engines. Built from billet material with black oxide finishing, this 166-tooth flexplate delivers durability and reliability in high-performance applications, with SFI certification confirming its safety standards for racing and serious automotive use.

This flexplate is engineered for engines requiring a sturdy power transfer solution between the engine and transmission. The two-piece RMS design optimizes rotating mass characteristics while the billet construction provides superior strength over cast alternatives. The 166-tooth configuration ensures proper engagement with compatible torque converters and starters, making it an ideal choice for street performance, drag racing, or restomod builds where reliability and precision engineering matter.

Key Features & Benefits

• Billet Construction: Manufactured from solid billet material for maximum strength and durability compared to cast flexplates.
• Black Oxide Finish: Protective black oxide coating resists corrosion and provides a professional appearance.
• SFI Certified: Meets SFI safety standards for use in racing and high-performance automotive applications.
• Two-Piece RMS Design: Optimized rotating mass system reduces inertial losses and improves engine response.
• 166-Tooth Configuration: Precision tooth count engineered for Oldsmobile big-block engines with proper torque converter engagement.

Specifications

Ideal Applications

• High-performance street driving and cruising with Oldsmobile big-block engines
• Drag racing and competition use requiring SFI-certified components
• Restomod and custom builds prioritizing reliability and precision engineering
• Engine swaps and rebuilds using Oldsmobile 400, 425, or 455 powerplants