This flywheel bolt is designed as a direct replacement for GM’s 19257940 flywheel/flexplate bolt for GM Gen III and Gen IV LS-series engines. It provides proper fastening for flywheel or flexplate installation during engine assembly or rebuilds. The bolt is sold individually — allowing builders to purchase only the quantity needed for their specific application.

Brian Tooley Racing BTR57940 Features:

• Fitment: GM Gen III and Gen IV LS engines
• Replacement for GM 19257940 flywheel/flexplate bolt
• Alloy-steel bolt designed for crankshaft-to-flexplate/flywheel connection
• Direct-fit replacement — no modification required
• Sold individually — appropriate for clutch swaps, rebuilds, or maintenance jobs

Brian Tooley Racing BTR57940 Notes:

• Sold individually — ensure correct total quantity for flywheel or flexplate install (typically 6 bolts for flexplate on LS)
• Follow proper torque procedure for LS flywheel bolts to ensure correct clamping and prevent loosening. Typical spec for many LS engines: torque in three-pass pattern of 15 lb-ft, then 37 lb-ft, then final 74 lb-ft — or follow OEM/flywheel manufacturer instructions. :contentReference[oaicite:4]{index=4}
• Use proper thread-locker if recommended by flywheel or clutch supplier