Best Square Automotive Replacement Header Gaskets in 2026

1-7/8" Diameter Round Port; Chevy V8 - 4.8L, 5.3L, 6.0L LS2 ('99-'08), 5.7L, LS1 LS6 ('97-'08), includes Vortec, Manifold or Headers, 2/Set

Port configuration comparable to Fel-Pro 1440

Heating and cooling of the exhaust system causes header and manifold flanges to warp resulting in gaps between the head and header which Remflex exhaust gaskets seal completely due to the thickness and compressibility of the 100 percent flexible graphite

2 1/2" Header Collector Gasket---- The exhaust header collector gaskets are especially designed for SBC BBC 302 350 454, and fit all 2.5 inch collector with Triangle (3 Bolt Pattern). brand new, please confirm whether the product is suitable before purchasing

High Quality Copper---- The exhaust header collector gasket is made of finest .041’’ thick solid copper with impeccable durability performance, wear-resisting, anti-strike, anti-scratch, dust-proof and colorfast

Sealing Performance---- Embossed port ridge for a perfect leak-proof seal, no additional sealant is required. No more worry about leaky header blues

3" Header Collector Gasket---- The header collector gaskets are especially designed for SBC BBC 302 350 454 383, and fit all 3 inch collector with Triangle (3 Bolt Pattern). brand new, please confirm whether the product is suitable before purchasing

High Quality Copper---- The header collector gasket is made of finest .041’’ thick solid copper with impeccable durability performance, wear-resisting, anti-strike, anti-scratch, dust-proof and colorfast

Sealing Performance---- Embossed port ridge for a perfect leak-proof seal, no additional sealant is required. No more worry about leaky header blues

Aluminum Reinforced Graphite Exhaust Manifold Gasket

Complete Hardware Kit for Installing Aftermarket Header to your Vehicle

Great for Replacement of Missing or Damaged Gaskets

🔧 【High Quality Copper】:The exhaust header collector gasket made of 2.5" solid copper 0.41" thick with impeccable durability performance, wear-resisting, anti-strike, anti-scratch, dust-proof and colorfast.without included bolts

🔧 【Wide Applicability】:This 2 1/2" Header Collector Gasket are especially designed for SBC BBC 302 350 454, and fit all 2.5 inch collector with Triangle (3 Bolt Pattern).

🔧 [Excellent Sealing Effect]: The exhaust header collector gasket uses a durable composite O-shaped design to form a tight leak-proof seal, without additional sealant, and can seal perfectly every time.

Manufactured from high-temperature acrylic blend exhaust material

Provides excellent sealing and durability

Can be trimmed if necessary for modified port applications

1-1/4 inch width x 1-5/8 inch height Large Square Port; Ford V8 - 289-351 Windsor, Large Square Port, (Aftermarket Cylinder Heads - 2" BH Spacing), 2/Set

For use with Aftermarket Cylinder Heads with 2" Bolt Hole Spacing on each port

There are no rubber binders or composite materials in Remflex exhaust gaskets so they will not shrink or harden due to time or temperature eliminating the need to go back and continually retighten your flange bolts

Package Dimensions :0.508 Cm L X14.605 Cm W X59.436 Cm H

Product Type :Auto Part

Country Of Origin :United States

Rectangle Port Copper Header Exhaust Gaskets Reusable

Compatible With: Small Block Chevy 262 267 283 302 305 327 350 383 400

Made with Copper/High Temp Inlay to ensure maximum durability

The Gsk Moto Header Exhaust Gaskets is suitable for SB, for Chevy 283-327-350-383-400 engines all.

Great replacement kit gets your car back to its best performance

Reusable and no sealant required

Remflex’s unique flexible graphite material has been proven for more than 30 years

1-1/8 inch width x 1-27 inch height Oval Port; Ford V8 - 289 ('63-'68), 302 ('69-'80), 1-1/8" x 1-27/32" Oval Port, Manifold or Headers, 2/Set

Remflex exhaust gaskets come in a standard 1/8 inch thickness and are designed to crush 50 percent allowing them to fill any pits or gaps in the flange surface up to 1/16 inch

Reflex's unique flexible graphite material has been proven for more than 30 years

Manifold or header applications

1-15/16 inch width x 2-5/32" Square Port; Ford V8 - 351 ('70-'74) Cleveland 4bbl Carb. (Includes Boss, High Output and Cobra Jet) Square Port, 2/Set

Aluminum Reinforced Graphite Exhaust Manifold Gasket

Complete Hardware Kit for Installing Aftermarket Header to your Vehicle

Great for Replacement of Missing or Damaged Gaskets

Aluminum Reinforced Graphite Exhaust Manifold Gasket

Complete Hardware Kit for Installing Aftermarket Header to your Vehicle

Great for Replacement of Missing or Damaged Gaskets