Extreme Duty Flexplate - SFI SBF 50oz Ext Balance

The Extreme Duty Flexplate - SFI SBF 50oz Ext Balance is a professional-grade flexplate engineered for Small Block Ford engines that demand reliability under high-horsepower and high-torque conditions. This component sits between your engine's crankshaft and torque converter, absorbing shock loads and transmitting power to the transmission while maintaining critical balance tolerances. Mechanics and performance builders choose this PRW Industries flexplate when stock units won't survive aggressive acceleration, heavy towing, or sustained boost scenarios—situations where inadequate flexplate design leads to cracking, spalling, or catastrophic converter failure.

Built from premium steel and rated to SFI 29.1 safety standards, the Extreme Duty Flexplate utilizes a 157-tooth ring gear designed for robust engagement with your starter motor, even under extreme cranking load. The 50-ounce external balance weight is pre-set to match Small Block Ford specifications, eliminating guesswork and ensuring your crankshaft, harmonic balancer, and flexplate form a harmonically balanced system—critical for eliminating vibration and preventing premature bearing wear. The reinforced construction resists flexing and fatigue cracking that commonly occurs in stock units, making it the go-to choice for turbocharged, supercharged, or naturally aspirated builds pushing beyond factory power levels.

This flexplate is ideal for any Small Block Ford engine—whether you're running a vintage hot rod, performance street car, or high-output truck platform—where transmission durability and engine longevity are non-negotiable. Installation requires removing the torque converter and old flexplate, then bolting the new unit to your crankshaft flange using factory bolts torqued to specification. Ensure your torque converter and harmonic balancer are also SFI-certified and properly balanced to maximize the protection this premium flexplate delivers. At 7.6 pounds, it's engineered to withstand repeated shock cycles while maintaining the precise balance geometry your engine needs.