Mr. Gasket Oil Pan Gasket - Molded Rubber

Fits 1965-1990 Chevy Big Block 396-454

PART# 6663G

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Mr. Gasket Molded Rubber Oil Pan Gasket for 1965-1990 Chevrolet 396,402,427,454 Mark IV Big Block. Manufactured from .093 inch thick high temperature silicone or nitrile blend molded rubber with a steel carrier. 1-piece design offers a tight, more leak-resistant seal by eliminating the gaps created by separate end seals. Torque limiters are built into the gasket to help prevent over tightening and splitting the gasket. It also features notched side rails, which is perfect when you have to grind clearance in the oil pan rail for stroker engines. Bonus: New oil pan bolts are included.


  • Manufactured from high temperature silicone blend or nitrile blend rubber
  • One piece molded construction provides a tight leak-proof seal
  • Torque limiters prevent over-tightening of fasteners and gasket splitting
  • Side rails are notched for stroker applications
  • Includes new oil pan bolts
  • Provides excellent sealing and durability
  • For OE replacement, high performance street, drag race and oval track use


BrandMr. Gasket
Emission Code5
EngineChevrolet Big Block Mark IV
Oil Pan Gasket MaterialMolded Rubber w/ Steel Carrier
One Piece Oil Pan GasketYes
Product TypeOil Pan Gaskets
Rear Main Seal StyleTwo Piece
Part Number6663G


This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

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