{"product_id":"mcs944685","title":"KB Performance Piston 3-5\/8\" Big Bore Piston Kit. +.010\" – 1948–1984 Big Twin with 3-5\/8 Big Bore…","description":"\u003ch2\u003eKB Performance Piston 3-5\/8\" Big Bore Piston Kit. +.010\" – 1948–1984 Big Twin with 3-5\/8 Big Bore…\u003c\/h2\u003e\n\u003cp\u003e3-5\/8\" big bore piston set. Used with 3 5\/8\" big bore cylinders with 5.330\" (stock) to 5.530\" (+.200\") length. Use with 4-1\/4\" stock stroke (88\"); 4-1\/2\" (93\"); 4-5\/8\" (96\") to 4-3\/4\" (98\") stroker flywheels. 10.0:1 CR. Piston weight 385gr. Piston pin weight 97gr. Head type: Dome \/ Dome -57cc. Compression height 1.285\" \/ Bore 3.625\" (3 5\/8\"). Stroke 4.250\" to 4.750\" (4-1\/4\" to 4-3\/4\"). Rod length 7.440\" \/ Cyl. length 5.330\" (Std) to 5.530\" (+.200\"). Comes with T6 heat treated 390 Hypereutectic cast pistons with 16% silicone levels which enables running a very tight clearance for longevity and hardly any piston noise. Note: Top compression ring will need additional clearance. See instructions. Note: 5.330\" cylinders can be used with stock 4-1\/4\" stroke. Longer strokes require correct length longer cylinders or stroker plates to achieve the desired compression ratio. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation.\u003c\/p\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003e48-84 Big Twin with 3-5\/8 big bore cylinders and strokes from 4-1\/4\" to 4-3\/4\" (88\" to 98\" engines)\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 944685\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KB-Performance Piston","offers":[{"title":"Default Title","offer_id":57378693906819,"sku":"MCS944685","price":295.86,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1329\/4265\/files\/944685k_9752fe0a-1cc1-4066-90d9-ab332ec5c0b6.jpg?v=1775575549","url":"https:\/\/hogparts.com\/products\/mcs944685","provider":"Hogparts UK Ltd","version":"1.0","type":"link"}