Home - Return to Previous Page
Additional Images

Cometic MLS Head Gaskets 4.200" Bore, .051" Thick, Chamfered for Pontiac 389 or 421, Butler Spec. (Set/2) COM-H4366SP3051S

Pontiac 389-421 4.200" Pocket Bore .051" Thick Cometic MLS Head Gaskets - Steel Embossed - Butler Spec Water (Set)
Also Fits Early 1967 400 with 389 style chamfers in the block
Pricing: $209.95



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.

Gasket Volume +11.8cc

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-H4366SP4051S
  • COM-H4366SP4051S
  • Cometic
  • New

Shipping Information

  • Item Requires Shipping
  • 2.0 lbs.

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.