{"product_id":"mcs561221","title":"Cometic Builders Cylinder Base Gasket Set. 3-1\/2\" Copper – 1984–1999 Evo Big Twin","description":"\u003ch2\u003eCometic Builders Cylinder Base Gasket Set. 3-1\/2\" Copper – 1984–1999 Evo Big Twin\u003c\/h2\u003e\n\u003cp\u003e3-1\/2\" standard bore. With ''type A'' style gaskets. Includes two of each in .005\"; .010\"; .015\" and .020\" thickness. These are specialty copper base gaskets for mechanics that want to achieve a specific compression ratio. Type A gasket explained: Type A'' gasket is the early type introduced on the 1984 Evolution Big Twin models; and can be used on all of the 84-99 Evo Big Twin models and will follow the contoures of the cylinder base perfectly. They will fit 86-22 Evo XL; but stick out at the cylinder base. Both type ''A'' and type ''B'' have identical inner bore diameter; oil hole and stud hole locations. Gaskets for front \u0026amp; rear cylinder are identical. Only difference between the ''A'' \u0026amp; ''B'' gaskets is the outside perimeter.\u003c\/p\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003e84-99 Evo Big Twin (NU)\u003c\/p\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Cometic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e MOTOR PARTS \u0026gt; CYLINDER BASE GASKETS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit:\u003c\/strong\u003e 8PK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct code:\u003c\/strong\u003e 561221\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Cometic","offers":[{"title":"Default Title","offer_id":57377718239619,"sku":"MCS561221","price":103.83,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1329\/4265\/files\/561221k_fc5a4d29-2b9b-407d-b795-8cfd6472de9d.jpg?v=1775724062","url":"https:\/\/hogparts.com\/products\/mcs561221","provider":"Hogparts UK Ltd","version":"1.0","type":"link"}