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Header Install Kit - Ultra-Seal - 265-400 Chevrolet Small Block Gen I 1955-91

Mr. Gasket, Ultra-Seal Material, Square Ports

PART# 7650G

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Header Installation Kit - Chevrolet V-8 1955-91 265-400 Square Port. Includes gaskets and fasteners necessary for header installation. Made using premium Ultra-Seal exhaust and collector gaskets. Mr. Gasket header and collector bolts deliver necessary clamp-load to seal flange mating surfaces.


  • Square Port Header Gaskets
  • Port Size 1.45" x 1.48"
  • Collector Gaskets 3.00" Diam. 3-Bolt Style
  • Includes Header Bolts & Collector Bolts


BrandMr. Gasket
Collector Diameter3"
Collector Gaskets IncludedYes
Emission Code3
EngineChevrolet Small Block Gen I
Gasket LineUltra-Seal
Port ShapeSquare
Port Size1.45" x 1.48"
Product TypeHeader Install Kit
WarrantyLimited 90 Day Warranty
Part Number7650G

Service Parts


This part is legal for use on Uncontrolled (Non-Emissions Controlled) Vehicles or Racing Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

Racing Vehicles are vehicles that are used exclusively for racing or other forms of competition that are not registered and that may never be used on the street.

Warranty Information

Limited 90 Day Warranty: See Details


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        *Free Shipping & Handling only offered to the contiguous US on orders over $100.

        Some parts are not legal for use in California or other states with similar regulations.