72 and 77 Electrode Exhaust Manifold Repair Kit


Cast Iron Exhaust Manifold Repair Kit includes:

77 is a premium electrode that produces welds which are high strength, crack resistant, and porosity free when applied to a wide variety of cast irons.  The special tri-metal core wire has a high current carrying capacity and the specially designed coating converts the impurities of the base metal into slag instead of being trapped in the deposit. The high deposition rate creates an extremely narrow heat affected zone– a feature suitable for all weldable cast irons requiring post-weld machining. But this is only one part of what’s included in the exhaust manifold repair kit.

77 cast iron welding rods are softer than nickel rods and have unique properties that allow the cast iron welds to stretch and elongate up to 300 percent more than other rods. This helps prevent the base metal and weld from cracking in the process.

Purchase your exhaust manifold repair kit today.

Key Features:

  • High-efficiency weld metal transfer eliminates electrode overheating
  • Crack-resistant formula eliminates the need for pre-heating or special cooling
  • Ideal for heavy machinery, trucking, bus lines, automotive, marine, and RVs
  • Repair cast iron exhaust manifolds, engine blocks, industrial machines and more


72 is a nickel-iron non-conductive electrode formulated to join contaminated and heat affected cast irons.

There are occasions in industry where exceedingly dirty and heat affected cast iron is encountered. 77, which bonds well to most cast iron, does have a limitation. Since 77 has controlled penetration, which is ideal for non-cracking and machinability, it may not be able to bond exceptionally dirty cast iron. 72 should be used for this application. It has a high penetration, can anchor deep into the subsurface of dirty or burnt cast iron, and seals in porosity generating contaminates prior to finish welding with 77. 72 is used for a cladding operation, then the weld is completed with 77.

Key Features:

  • Flux coating does not side arc even after being heated
  • Great for carbon displaced cast irons
  • Anchors into heat affected exhaust manifolds
  • Extra nickel content insures crack resistance machinable weld


Quantity of rods for this item depends on diameter:

  • 5/32:  2 rods 77 electrode, 2 rods 72 electrode
  • 3/32:  3 rods 77 electrode, 3 rods 72 electrode
  • 1/8:  2 rods 77 electrode, 2 rods 72 electrode
CALIFORNIA PROPOSITION 65:  WARNING: This product contains chemicals including [Nickel], which are known to the State of California to cause cancer.  For more information go to

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