{"product_id":"kb-performance-3-5-8-big-bore-forged-piston-kit-040","title":"Kb Performance, 3 5\/8 Big Bore Forged Piston Kit. +.040\"","description":"\u003cp\u003eForged 3-5\/8 big bore piston set. Used with 3-5\/8\" big bore cylinders with 5.330\" (stock) to 5.530\" (+.200\") length. Must use 4-1\/4\" (stock) (88\"); 4-1\/2\" (93''\"); 4-5\/8\" (96\") to 4-3\/4\" (98\") stroker flywheels.  8.50:1 CR with 117cc head; 4.250\" stroke \u0026amp; Std. cyl. length.  9.38:1 CR with 117cc head \u0026amp; 4.750\" stroke \u0026amp; Std. cyl. length.  Piston weight 440gr.  Piston pin weight 97gr.  Piston pin dia. .791\" \/ offset.  Head type: Dome with -42.3cc.  Compression height 1.285\".  Bore 3.625\".  Stroke 1.250\" to 4.750\".  Rod length 7.440\".  Cyl. length 5.530\" Std to +.200\" higher.  All KB forged pistons are made from 4032 alloy; a 11% silicon alloy that is formed in a forging press. Forging aluminum gives a superior strength and structural integrity on a molecular level; after which it is fully machined. The combination of this alloy and the forging process allows the piston to flex under detonation; or pre-ignition; giving the best resistance to cracking. Although 4032 has a low expansion rate; it is higher than the cast Hypereutectic. Therefore forged KB pistons will require about .001\" wider piston to wall clearance. Pistons are sold as sets; complete with wrist pin retaining rings; wrist pins and piston rings. Please note that all KB forged pistons come equipped with offset wrist pins \/ piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions; as provided with each pi\u003c\/p\u003e","brand":"Kb Performance Piston","offers":[{"title":"Default Title","offer_id":50010499481928,"sku":"944807","price":330.9,"currency_code":"EUR","in_stock":true}],"url":"https:\/\/holydeath.com\/products\/kb-performance-3-5-8-big-bore-forged-piston-kit-040","provider":"Holy Death Motorcycle Co.","version":"1.0","type":"link"}