399473 SFI-Approved Flexplate | Big Block Chevy 454 Mark IV 2-Piece Rear Main |
InfoVehicle Info Needed
TCIPART NUMBER: 890-399473

399473 SFI-Approved Flexplate | Big Block Chevy 454 Mark IV 2-Piece Rear Main |

$14795
ShippingShips Today
Lowest PriceLowest Price Guarantee

Items You Need

Torque Converter Bolts For TH350, TH400 and Powerglide Converters [Set of 3]

JEGS

Torque Converter Bolts For TH350, TH400 and Powerglide Converters [Set of 3]

Part Number : 555-82501
$899$9.99
You Save$1.00
Pro Series Flexplate Bolts Chevy 90° V6 & 265-454 with 2-pc Rear Seal

ARP

Pro Series Flexplate Bolts Chevy 90° V6 & 265-454 with 2-pc Rear Seal

Part Number : 070-200-2902
$2199
Turbo 350, 400, W/Production Converter 3/8" -24

ARP

Turbo 350, 400, W/Production Converter 3/8" -24

Part Number : 070-230-7301
$2199
Turbo 350, 400, W/Race Converter 1/2" Thick Tabs

ARP

Turbo 350, 400, W/Race Converter 1/2" Thick Tabs

Part Number : 070-230-7303
$1299

Chevrolet SFI 29.1 Approved Flexplates
    SFI-Approved Flexplate
  • Big Block Chevy 454 Mark IV 2-Piece Rear Main
  • Dual Bolt Pattern
  • External Balance
  • 168-Tooth


    Dual Bolt Pattern: LS Bolt Pattern (11.1") and GM Small Bolt Pattern (10-3/4")

    SFI-Approved Racing Flexplates

    TCI Heavy-Duty Flexplates are .0350 in. thicker than stock plates in order to withstand the stress of high-RPM engines and high-stall torque converters. Chevy 168-tooth plates have dual bolt patterns to accommodate both Powerglide and Turbo-Hydramatic (TH) torque converters. TCI also offers externally-balanced Small Block Ford to GM Transmission Adapter Flexplates that feature a built-in pilot adapter and a dual bolt pattern for a simple bolt-on installation. Note: For use with a racing converter or GM Powerglide adapter.

    Show More

    When your build demands strength, durability, and reliable performance under fire, the TCI Heavy-Duty Flexplates deliver exactly that. These heavy-duty components are built to last, especially for high-stall torque converters and high-RPM engines.

    TCI flexplate models are thicker than stock—specifically .0350 inches extra—to resist warping, cracking, or damaging deflection when torque and revs rise. Chevy 168-tooth plates in this line feature dual bolt patterns so they work with both Powerglide and Turbo-Hydramatic transmissions. These plates are precision engineered to maintain alignment, retain structural integrity, and handle the stresses OEM parts can’t reliably overcome.

    If you’re running an LS swap or high output small block, a TCI LS1 Flexplate option gives you a bolt-on upgrade with improved durability, especially if you’ve upgraded torque converter size, stall speed, or intend to push rev limits. Compatibility across various bolt patterns, balanced designs, and high-quality materials mean you can upgrade without compromising fitment or strength.

    A chevy flex plate from this line isn’t just about brute force—it’s about maintaining reliability under load. Proper flexplate selection protects your torque converter, starter, crank flange, and ultimately your transmission. Whether for racing, high performance street, or demanding duty, using a heavy-duty version pays in longer life, fewer failures, and cleaner engagement. Add a Heavy-Duty Flexplate to your setup to get the peace of mind and performance your drivetrain deserves.

Part TypeFlexplate
Product LineTCI Heavy-Duty Flexplates
BrandTCI
Package Height1.1
Package Width14.4
Package Length14.6
Weight7.25 PG
Part CategoryPerformance Parts
Ring Gear Tooth Quantity168-tooth
Flexplate MaterialSteel
Rear Main Seal Style2-piece
QuantitySold individually
Part FitmentSemi Universal
Safety RatingSFI 29.1
Engine BalanceExternal
Vendor Part Number399473
Package Qty1
Package TypeEA
No Questions
No Reviews

ITEM YOU MAY ALSO CONSIDER

Heavy-Duty SFI Flexplate for 1970-1990 Big Block Chevy 454 Mark IV

JEGS

Heavy-Duty SFI Flexplate for 1970-1990 Big Block Chevy 454 Mark IV

Part Number : 555-601075
$8699$95.99
You Save$9.00
SFI Approved Flexplate Big Block Chevy 454

ALLSTAR PERFORMANCE

SFI Approved Flexplate Big Block Chevy 454

Part Number : 049-ALL26820
$7499
Stock Replacement Flexplate Big Block Chevy 454

ALLSTAR PERFORMANCE

Stock Replacement Flexplate Big Block Chevy 454

Part Number : 049-ALL26825
$6399
SFI-Approved Flexplate Up To 1990 Big Block Chevy 454

B&M

SFI-Approved Flexplate Up To 1990 Big Block Chevy 454

Part Number : 130-20233
$19295
Some parts are not legal for use in California or other states with similar laws / regulations
p65 warning