These high performance head gaskets have a stainless steel ring (fire ring) around the combustion chamber to prevent blow out. They are .042" thick. They have proven to work very well! AVAILABLE IN:• 70mm temporarily out of stock• 71mm Temporarily out of stock• 72mm temporarily out of stock• 73mm temporarily out of stock• 76mm• 77mm temporarily out of stock• 78mm * for Modified Engines it is recommended to use a Breather Bypass System. Click this link to check it out and add to your cart. ($39.95) Depending on the size of the bore the oil passage in the gasket has been left out since for large cylinders the hole may be very close to the bore. You can add the hole with a die grinder if you like. It is recommended to use a light coating of a good sealer such as Honda or Toyota Bond or Permatex "The Right Stuff" silicone sealer on both sides of the gasket.
