Oil Cooler Sandwich Plate Gen 1-2 SBC & Mk. 1-6 BBC Engines

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  • Add an oil cooler to Gen 1-2 Chevy Small blocks and Mark 1-6 Chevy Big Blocks
  • Includes 13/16"-16 410 stainless steel filter bung extension screws
  • Made in the USA
  • Lifetime Warranty

Improved Racing Warranty Badge

Part # EGM-125

This sandwich plate kit allows plumbing an oil cooler to Gen 1-2 SBC and Mk. 1-6 BBC engines. The kit includes an Improved Racing ENV-139 sandwich plate, the ENV-118 filter spacer and 410 stainless steel 13/16"-16 filter bung extension screws.

The sandwich plate will accommodate filters with gaskets up to 3.0" in outer diameter. See the Documentation tab for a list of recommended filters. 

Features -10AN female O-ring boss ports for plumbing an oil cooler. Adapter fittings are available for common line sizes.

Features and Benefits

  • 6061-T6 billet aluminum construction with black MIL-A-8625 Type II anodized finish
  • Filter bung extension screws are machined from hardened 410 stainless steel for excellent durability
  • Made in USA
  • Lifetime Warranty


  • 1x ENV-139 oil coler sandwich plate
  • 1x ENV-118 oil filter adapter spacer for Gen 1-2 SBC and Mk 1-6 BBC engines
  • 2x Sealing O-rings
  • 2x 13/16"-16 stainless steel filter bung extension screw


  • Gen 1-2 Chevrolet Small Block Engines
  • Mark 1-6 Chevrolet Big Block Engines
  • Fits filters with gasket inner diameter from 2.0" up to maximum gasket outer diameter of 3.0"


Part #
Drop Ship Item
Special Order Item
Improved Racing
Primary Material
6061-T6 aluminum
Type II Anodized
Minimum Operating Temperature
-40°F (-40°C)
Maximum Operating Temperature
302°F (150°C)
Inlet Port Size
-10AN O-Ring Boss Female
Outlet Port Size
-10AN O-Ring Boss Female
Maximum Operating Pressure
300 psi (20.68 bar)
Max Recommended Flow Rate
Up to 20 GPM (76 LPM)
Fluid Compatibility
Air and gas
Engine oil
Ethanol-based fuels (E85+)
Ethanol/gasoline mixtures
Gear oil
Nitrous Oxide
Racing fuels
Transmission fluid
Oil Filter Flange Inner Diameter
2.00" (50.8mm)
Oil Filter Flange Outer Diameter
3.00" (76.2mm)
Filter O-Ring Inner Diameter
3.40" (86mm)
Filter O-Ring Outer Diameter
3.80" (96mm)
Filter O-Ring Material
Nitrile (NBR)
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