GM LS1 LS2 LS3 With Turbo 350 400 Conversion Flexplate Bolts

GM LS1/LS2/LS3 to TH400 Turbo 350/400 Conversion Flexplate Bolts Kit

Upgrade your LS-series build with a purpose‑built bolts kit from Aeroflow. Designed for GM LS1/LS2/LS3 engines paired with TH400 transmissions or Turbo 350/400 conversions, this six‑bolt kit provides the strength and reliability needed to securely attach your flexplate under demanding conditions.

• Contains: 6 x bolts
• Under head length: 27.3 mm
• Overall length: 33.85 mm
• Thread: M11 x 1.50 mm
• Torque setting: 74 ft-lbs (100 Nm)
• Material/finish: Chrome moly 8740 with black oxide finish for corrosion resistance

Compatibility and use

Suits GM LS Series engines when used with a TH400 transmission (including Turbo 350/400 conversion setups). If you’re installing a new flexplate, replacing the original bolts helps prevent fatigue and plate loosening over time.

Installation tips

• Use Loctite 262 or a similar threadlocker to prevent loosening over time.
• Torques should be applied to the manufacturer’s specifications for your drivetrain; for this kit, tightening to 74 ft-lbs (100 Nm) is specified.

With its chrome moly 8740 construction and protective black oxide finish, these bolts offer dependable strength and improved corrosion resistance, helping ensure lasting performance in high-stress LS-to-TH400 applications.