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

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Part #
  • 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.

Please note the sandwich plate will only accommodate filters with gaskets up to 3.0" in outer diameter and is NOT compatible with original SBC / BBC filters, which are larger in diameter. A modern filter such as the AC Delco PF59 or PF46, or Wix 51522 or 51042 are all good choices and flow as well as the larger original filters. 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
  • Does not fit ZR1 427 Anniversary Edition
  • Fits filters with gasket inner diameter from 2.0" up to maximum gasket outer diameter of 3.0"


Part #
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)
Instruction Manuals
Recommended oil filters for Improved Racing remote filter mounts
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