BTR CRANK GEAR - AFTERMARKET GEN III/IV LS CRANKSHAFT IN OEM GEN V BLOCK - CHAMFERED END AND I.D. GRIND - BTR31217
$53.99
BTR CRANK GEAR - AFTERMARKET GEN III/IV LS CRANKSHAFT IN OEM GEN V BLOCK - CHAMFERED END AND I.D. GRIND - BTR31217
The BTR31217 Crank Gear is the ultimate problem-solver for custom cross-generation engine builds.Engineered by Brian Tooley Racing, this specialty crank gear allows you to seamlessly install a high-performance aftermarket Gen III/IV LS crankshaft into an OEM Gen V engine block
Why You Need It
Interchanging OEM and aftermarket components between Gen III/IV and Gen V setups introduces two significant geometric roadblocks at the crankshaft snout:
The Fillet Radius Conflict: Factory cranks use a rolled fillet, allowing standard gears to sit flat. High-performance aftermarket cranks typically feature a larger, 3mm (.125”) conventional fillet radius for added strength. Standard crank sprockets will bind on this radius, placing them under extreme pressure until they eventually split under high RPM.
The Snout Inner Diameter (I.D.) Variation: Aftermarket Gen III/IV LS crankshafts feature a different snout profile compared to Gen V platforms.
The BTR31217 eliminates both issues simultaneously. It features a precision-machined inner diameter (I.D.) grind alongside a specialized chamfered end to perfectly clear the heavy-duty fillet radius. This guarantees a flush, worry-free seat against the mating face of the snout.