SBF 157 Tooth SFI Flexplate Internal Bal.

The SBF 157 Tooth SFI Flexplate Internal Bal. is a precision-engineered flexplate engineered for small-block Ford V8 engines requiring SFI 29.1 certification for high-performance and racing applications. This component bridges the engine's crankshaft to the torque converter, absorbing vibration and torsional stress while allowing smooth power transfer to the transmission. Built for builders and enthusiasts who demand reliability in modified engines, this flexplate is essential for any custom V8 build running a street or strip application where OEM parts fall short of performance demands.

The 157-tooth design provides optimal engagement with starter motors on small-block Ford platforms, while the internal balance configuration means this unit is weighted to match your engine's exact harmonic characteristics—critical for minimizing vibration and extending crankshaft and transmission bearing life. The 10.5-inch bolt circle diameter conforms to standard SBF mounting patterns, and the steel construction combined with SFI 29.1 compliance ensures it will safely contain any catastrophic failure without compromise. The 6.05-pound weight specification reflects the precision machining and quality steel stock required to meet SFI safety standards, guaranteeing you're not just buying a component—you're investing in engine integrity and driver safety.

This flexplate is ideal for engine builders, race teams, and serious enthusiasts restoring or upgrading small-block Ford V8 engines in street rods, muscle cars, drag cars, and hot rods. If you're pairing a modern automatic transmission with a vintage or performance-built SBF engine, proper internal balance matching is non-negotiable—mismatched balance can cause vibration, premature wear, and catastrophic failure at high RPM. Installation requires careful alignment and torque-to-spec fastening; verify your engine's original balance specifications before ordering to ensure this unit matches your crank and damper configuration. Sold individually; confirm your bolt circle diameter and tooth count compatibility with your starter before purchase.