Bulletproof Your GM LS, LT and Vortec Engines With SFI Flexplate Kits

Building a high-performance GM engine requires serious investments of both time and money. The absolute last thing any engine builder wants is a catastrophic mechanical failure sitting right between the engine block and an expensive transmission. Factory stamped plates simply bend, crack and break under serious power loads during aggressive track days or drag strip passes. Upgrading the driveline with the new SFI Flexplate Kits from ATI Performance Products offers the perfect mechanical insurance for your next big horsepower project.

The engineering team at ATI recently released these incredibly tough 139-tooth, 10 DP units specifically designed for modern GM platforms. Every single package includes an SFI 29.1 certified plate, a precision-machined crank adapter and high-strength ARP bolts to keep everything firmly locked together under immense stress.

• 6-Bolt Version (Part #915578): Builders running popular LS1 through LS7 or L98 engines can easily grab this version.
• 8-Bolt Version (Part #915579): For those pushing extreme boost through an LT1, LT4, ZL1 or a CTS-V with LSA and LSX setups, this kit handles the heavy lifting perfectly.

Slipping these SFI Flexplate Kits into a custom build does require an aftermarket 10 DP pinion starter alongside an aftermarket-style torque converter. Thankfully, installers never need to worry about sourcing a special LS-length pilot or adapter to make the connection work perfectly.

ATI manufactures these critical driveline components completely in-house using their modern CNC equipment. Robotic welders apply double MIG and TIG welds directly to certified American-made materials for maximum structural integrity.

This massive attention to detail means every unit easily exceeds strict racing safety specifications. The entire machining process follows actual OEM drawings to guarantee perfect mounting accuracy, and each unit undergoes strict quality inspections before leaving the facility. The factory ensures they exceed original flatness and run-out tolerances before precision balancing them down to a staggering 0.1-ounce resolution.

Dropping one of these SFI Flexplate Kits behind your GM LS, LT or Vortec engine brings absolute peace of mind whenever you hit the throttle and launch down the track. You get a completely bulletproof connection that easily handles whatever massive horsepower numbers your custom build throws at the pavement.