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What Flexplate or Flywheel Does My BluePrint Engine Require?

Selecting the correct flexplate or flywheel is critical for proper starter engagement, transmission compatibility, and engine balance. Using the wrong component can cause vibration, starter damage, transmission installation issues, and premature drivetrain wear. Always verify your engine part number before ordering. Many BluePrint engines use different balance configurations even within the same engine family. Product specifications and Knowledge Base data should always be used as the final authority.

 Flexplate & Flywheel Quick Reference Chart

Engine Family Common Engine Part Numbers Balance Configuration Required Flexplate / Flywheel Recommended BluePrint Part Numbers
BP350 Series BP3501CT, BP3502CT, BP3504CT Internal Balance Non-Weighted Verify by engine part number
BP355 Series BP3550CT Series Internal Balance Non-Weighted Verify by engine part number
BP38318 Series BP38318CT1, BP38318CTC1, BP38318CTF1 External Front & Rear Late 350 Weighted BPP400L
BP38317 Series (Power Adder) BP38317CT1 Internal Front / External Rear Late 350 Weighted BPP350
BP400 Series BP4002CT Series External Balance 400 Weighted BPP400L
PSLS376 Series PSLS37630CTF, PSLS37650CTF, PSLS3763CTFK1 Internal Balance Transmission Specific Verify transmission package
BLS427 Series BLS427 Series Internal Balance Transmission Specific Verify transmission package
LS454 Series LS454 Series Internal Balance Transmission Specific Verify transmission package
BP427BBC Series BP427BBC Series Internal Balance Non-Weighted BPP454I
BP496 Series BP4961CT Series Internal Balance Non-Weighted BPP454I
BP509 Series BP5091CT Series Internal Balance Non-Weighted BPP454I
PS5401 / PS5403 Series PS5401CT, PS5403CT1 Internal Balance Non-Weighted BPP454I
BP302 Series BP302 Series 28 oz External Balance 28 oz Weighted BPP529618, BPPF28164
BP3479 Series BP3479CT, BP3479RCT, BP3479CTF, BP3479CTFD 28 oz External Balance 28 oz Weighted BPP529618, BPPF28164, BPPF157T28
BP363 Series BP363 Series 28 oz External Balance 28 oz Weighted BPP529618, BPPF28164, BPPF157T28
BP427W Series BP427W Series Internal Balance Non-Weighted Verify by engine part number
BP408 Series BP408 Series External Balance Weighted Verify by engine part number
HEMI 354 Series HEMI354 Series Internal Balance Hemi Specific Verify transmission package
HEMI 426 Series HEMI426 Series Internal Balance Hemi Specific Verify transmission package
Builder Series Builder Series Engines Varies Verify by engine part number Verify by application
Drag Racing Series NHRA / Drag Racing Engines Varies Verify by engine part number Verify by application
Drag / Auto-X / Drift / Off-Road Series Motorsports Engines Varies Verify by engine part number Verify by application

Important

  • Internal balance engines require a non-weighted flexplate or flywheel.
  • External balance engines require the correct weighted flexplate or flywheel.
  • Ford 28 oz applications use BPP529618, BPPF28164, or BPPF157T28 depending on transmission type.
  • LS and Hemi applications should always be verified against the transmission package being used.
  • Always verify the exact engine part number before ordering drivetrain components.