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Cometic MLS 4.200" Bore, .060" Thick, Chamfered for Pontiac 389 or 421, Butler Spec. (Set/2) COM-H4366SP3060S

Pontiac 389-421 4.200" Pocket Bore .060" Thick Cometic MLS Head Gaskets - Steel Embossed - Butler Spec Water (Set)
Also Fits Early 1967 400 with 389 style chamfers in the block
Pricing: $259.95



Multi-Layer Steel (MLS) head gaskets contain load-controlled embossments which conform load distribution across sealing the area. This creates an exceptional seal by requiring less clamp load resulting in less bore distortion.

The stainless steel outer layers are coated with FKM (Viton), a high temperature/chemical resistant polymer. A topcoat of PTFE (Teflon) aids in resistance to fret and increased cold sealing.


  • COM-H4366SP4060S
  • COM-H4366SP4060S
  • Cometic
  • New


Shipping Information

  • Item Requires Shipping
  • 2.0 lbs.

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