{"product_id":"mcs944802","title":"KB Performance Piston 3-5\/8 Big Bore Forged Piston Kit. STD – 1948–1984 Pan; Shovel. With 3-5\/8 Big…","description":"\u003ch2\u003eKB Performance Piston 3-5\/8 Big Bore Forged Piston Kit. STD – 1948–1984 Pan; Shovel. With 3-5\/8 Big…\u003c\/h2\u003e\n\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\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003e48-84 Pan; Shovel. With 3-5\/8 big bore cylinders (NU)\u003c\/p\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e KB Performance Piston\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e MOTOR PARTS \u0026gt; PISTONS AND RINGS KITS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit:\u003c\/strong\u003e SET\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct code:\u003c\/strong\u003e 944802\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KB-Performance Piston","offers":[{"title":"Default Title","offer_id":57378706391427,"sku":"MCS944802","price":266.08,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1329\/4265\/files\/944802k_289b9470-c4b7-4295-951a-16514002f2c3.jpg?v=1775575504","url":"https:\/\/hogparts.com\/products\/mcs944802","provider":"Hogparts UK Ltd","version":"1.0","type":"link"}