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Mr. Gasket Copper Seal Header Gaskets 7174

Mr. Gasket Copper Seal Header Gaskets 7174
$107.99 ea
NEWARRIVING SOONEstimated Ship Date 12/24/2025 (If Ordered Today)100 Available from HOLLEY PERFORMANCE PRODUCTS as of 12/08/2025
Model: 4012210
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
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Mr. Gasket CopperSEAL Header Gaskets are a high quality copper gasket that performs extremely well and are reusable. We recommend this in all racing and high performance applications. They are for stock heads unless indicated, and work well in high heat and turbocharged applications.
Features:
  • Manufactured from “Dead Soft” (solid) .043" thick copper material
  • .051" embossment around each exhaust port to seal irregular surfaces. Total gasket thickness .094"
  • Provides excellent sealing and durability
  • Conforms to and seals minor surface irregularities
  • For high performance street, drag race, oval track and turbocharged (extreme heat) applications

Downloads:

Download Name File Size
mr_gasket_instructions_copperseal_exhaust_gaskets.pdf74.66KB

Videos:

Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Years Engine Fitment Notes
American Motors AMX 1970 5.9L / 360 / V8
6.4L / 390 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors AMX 1978 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors AMX 1979 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Ambassador 1970 5.0L / 304 / V8
6.4L / 390 / V8
5.9L / 360 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Ambassador 1971 6.6L / 401 / V8
5.0L / 304 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Ambassador 1972 6.6L / 401 / V8
5.0L / 304 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Ambassador 1973 6.6L / 401 / V8
5.0L / 304 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Ambassador 1974 6.6L / 401 / V8
5.0L / 304 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Concord 1978 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Concord 1979 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Gremlin 1972 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Gremlin 1973 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Gremlin 1974 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Gremlin 1975 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Gremlin 1976 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Hornet 1970 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Hornet 1971 5.0L / 304 / V8
5.9L / 360 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Hornet 1972 5.0L / 304 / V8
5.9L / 360 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Hornet 1973 5.0L / 304 / V8
5.9L / 360 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Hornet 1974 5.0L / 304 / V8
5.9L / 360 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Hornet 1975 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Hornet 1976 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Hornet 1977 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Javelin 1970 6.4L / 390 / V8
5.0L / 304 / V8
5.9L / 360 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Javelin 1971 5.0L / 304 / V8
5.9L / 360 / V8
6.6L / 401 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Javelin 1972 5.0L / 304 / V8
5.9L / 360 / V8
6.6L / 401 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Javelin 1973 5.0L / 304 / V8
5.9L / 360 / V8
6.6L / 401 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Javelin 1974 5.0L / 304 / V8
5.9L / 360 / V8
6.6L / 401 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Matador 1971 5.0L / 304 / V8
5.9L / 360 / V8
6.6L / 401 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Matador 1972 5.0L / 304 / V8
5.9L / 360 / V8
6.6L / 401 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Matador 1973 5.0L / 304 / V8
5.9L / 360 / V8
6.6L / 401 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Matador 1974 5.0L / 304 / V8
5.9L / 360 / V8
6.6L / 401 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Matador 1975 5.0L / 304 / V8
5.9L / 360 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Matador 1976 5.0L / 304 / V8
5.9L / 360 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Matador 1977 5.0L / 304 / V8
5.9L / 360 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Matador 1978 5.9L / 360 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Pacer 1978 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Pacer 1979 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Rebel 1970 5.0L / 304 / V8
6.4L / 390 / V8
5.9L / 360 / V8		 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;
American Motors Spirit 1979 5.0L / 304 / V8 COPPER SEAL; EXHAUST GASKET SET; DOG LEG PORT; PORT DIMENSIONS W-1.25 IN. X H-1.75 IN.;

Specifications:

Collector Gaskets Included No
Emission Code 5
Engine American Motors V8
Gasket Line Copper-Seal
Material Copper
Part Type Exhaust Manifold Gasket Set
Port Shape Dog Leg
Port Size 1.25" x 1.75"
Product Type Header Gaskets
Proposition 65 www.P65Warnings.ca.gov
Thickness .094"
Warranty Limited 90 Day Warranty TX, Limited 90 Day Warranty
Weight 0.7500

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