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Mr. Gasket Ultra-Seal Header Install Kit

Fits 1955-1991 Chevrolet 265-400 Gen I Small Block with Square Ports

PART# 7650G

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Header Installation Kit - Chevrolet V8 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 Diameter3.00 inch
Collector Gaskets IncludedYes
Emission Code5
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 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.

Warranty Information

Limited 90 Day Warranty: See Details


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