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Header Gaskets - Aluminum-Layered - 396-454 Chevrolet Big Block Mark IV 1965-90

Flowtech, Dead Soft Layered Aluminum Material, Round Ports

PART# 99153FLT

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FLOWTECH REAL-SEAL header and collector gaskets are a revolutionary break-through in exhaust sealing technology. Constructed of separate layers of "Dead Soft" aluminum, REAL SEALS provide a do-it-once solution that will not burn or blow out. REAL-SEAL gaskets will work when an o-ringed gasket won't because the "Dead Soft" aluminum conforms to create a leak-proof seal. REAL-SEALS can also be easily trimmed for port-matching and you can use them over and over again.


  • Multi -Layer "Dead Soft" aluminum conforms to create a leak-proof seal.Water/Weather Resistant
  • Re-Useable
  • Will Not Burn Or Blow Out
  • Suitable For Port-Matching
  • Made In USA


Collector Gaskets IncludedNo
Emission Code5
EngineBig Block Chevy
Gasket LineMLS
Port ShapeRound
Port Size2.15"
Product TypeHeader Gaskets
Type of ComponentExhaust Gaskets
Part Number99153FLT



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.

Tech Resources

Fits only with port shape listed. Please verify port shape on header and match to proper gasket.


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