GM LT Series Engine Oil Cooler Block-Off Cover Plate

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GM LT Series Engine Oil Cooler Block-Off Cover Plate

Improved Racing's oil cooler block-off / bypass cover plate installs over the oil cooler ports found on some GM Gen V small-block (LT series) oil pans. This kit can be used to delete the oil cooler circuit.

The bypass cover is CNC-machined from billet 6061-T6 aluminum and Type II anodized in black. It features a large ported internal cavity with smooth features to improve flow characteristics when compared to the factory diecast bypass cover.

Features & Benefits

  • Bypass cover is CNC-machined from 6061-T6 billet aluminum, Type II anodized in black, and laser marked.
  • Improved flow characteristics over the factory diecast bypass cover.
  • Replacement for factory bypass cover, GM part # 12630766. 


  • Bypass cover
  • Rubber and aluminum bonded gasket
  • Mounting screws


  • 2014-2019 Chevrolet Corvette (C7), all models
    • Factory oil cooler delete is required. Use Improved Racing delete kit part # EC7-681.
    • Corvette oil pan part numbers:
      • 12684491
      • 12696685
      • 12696686
  • 2014+ GM EcoTec3 V8 5.3L, 6.2L and 6.6L trucks, oil pan part numbers:
    • 12707243
    • 12684607
    • 12696280
    • 12684605
    • 12666995
  • Holley Gen V LT Pans, part numbers:
    • 302-20
    • 302-20BK
    • 302-21
    • 302-22
  • May fit GM trucks with Gen V Chevrolet small block V8 engines
  • May fit other vehicles using the Gen V Chevrolet small block LT1, LT4, LT5, L86 and L83 engines
  • Does not fit GM truck oil pan part # 12696280
  • Does not fit 6th Gen Camaro SS and ZL1 oil pan
  • Does not fit 2014-2019 Cadillac CTS-V oil pan
  • Does not fit 2020+ Cadillac CT5 Blackwing oil pan


Part #
Primary Material
6061-T6 aluminum
Improved Racing
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