Flexplates & Block Plates

If you're looking for the highest quality flexplate on the market today check out this new 1 piece design from Boninfante.  Designed to work with GM Gen 3 & 4 LS engines with the 6 bolt crank flange.  This 168 tooth flexplate is  drilled for multiple converter patterns and it will allow you to mate up to the GM LS 4L65E(11.063" bolt circle), 4L80/85E, & 6L80/6L90E transmissions.

Features:

• One-piece design with integral ring gear
• Specially selected aerospace grade alloy steel from USA steel mills
• Proprietary 3-stage heat treating process
• Hard machined to exacting tolerances (.002 TIR)
• Boninfante’s proprietary stress proofing and finishing process
• Finished in a beautiful black oxide
• Tested to 20,000 RPM which exceeds SFI safety standard 29.2

If you're looking for the highest quality flexplate on the market today check out this new 1 piece design from Boninfante.  Designed to work with the new GM Gen V LT1, LT4, LT5 engines as well as the previous 8 bolt crank LSA and LSX engines.  This 168 tooth flexplate is  drilled for multiple converter patterns and it will allow you to mate up to the GM 4L80/85E, 6L80/6L90E, 8L90E, 10L80/90E transmissions.

Features:

• One-piece design with integral ring gear
• Specially selected aerospace grade alloy steel from USA steel mills
• Proprietary 3-stage heat treating process
• Hard machined to exacting tolerances (.002 TIR)
• Boninfante’s proprietary stress proofing and finishing process
• Finished in a beautiful black oxide
• Tested to 20,000 RPM which exceeds SFI safety standard 29.2

This is the ONLY SFI rated flexplate available today for the new GM 10 speed automatic!

Steel block plate for small block Ford with automatic transmission. Has dual starter cut-out and break-away lower converter access cover.

• Made from quality H-60 steel
• Use with 350 Flexplate for external balanced 383 or 400 engines
• Offset for OEM Flexplate to crank clearance
• Zinc plated
• Stamped "Engine side"