{"product_id":"62264-performance-piston-sets-for-big-twin","title":"Pistons Keith Black Perf 9:1 Std Bore Big Twin 1200Cc W \/ Pinstrument Locks \u0026 Rings 3.438\"Std Bore Std Compression","description":"\u003ch1\u003ePERFORMANCE PISTON SETS FOR HARLEY DAVIDSON BIG TWIN\u003c\/h1\u003e\u003cp\u003eWEIGHT: 2.75\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSPAWNED FROM THIS SUCCESSFUL MANUFACTURER'S LINE OF AUTOMOTIVE PISTONS\u003c\/li\u003e\n\u003cli\u003eLIGHTWEIGHT PERMANENT MOLD CAST PISTONS\u003c\/li\u003e\n\u003cli\u003eMANUFACTURED FROM HYPEREUTECTIC 390 ALLOY , CONTAIN 16-18% SILICON , AND HEAT TREATED TO T6 SPECIFICATIONS PRODUCING A STRONGER THAN STOCK PISTON\u003c\/li\u003e\n\u003cli\u003eSPECIAL ALLOY COMPOSITON KEEPS HEAT CONFINED TO THE COMBUSTION CHAMBER AND REDUCES HEAT TRANSFER TO THE PISTON ITSELF PRODUCING A COOLER RUNNING PISTON\u003c\/li\u003e\n\u003cli\u003eCAN BE FITTED WITH A CLEARANCE AS SMALL AS .00075\"\u003c\/li\u003e\n\u003cli\u003ePISTON EXPANSION IS REDUCED BY AS MUCH AS 20% OVER CONVENTIONAL PISTONS\u003c\/li\u003e\n\u003cli\u003eLESS PISTON ROCK , BETTER RING SUPPORT , MORE DURABILITY AND BETTER RETAINED COMPRESSION FOR MAXIMUM POWER\u003c\/li\u003e\n\u003cli\u003eTHE KEY FEATURE TO THESE PISTONS IS THE ACCUMULATOR GROOVE BETWEEN THE TOP AND SECOND RING WHICH AVERAGES THE NORMAL PRESSURE BETWEEN THE FIRST AND SECOND RING , KEEPING THE PRESSURE LOW ENOUGH TO PREVENT LIFTING OF THE TOP RING WHILE MAINTAINING PRELOAD ON THE SECOND (OIL SCRAPING) RING\u003c\/li\u003e\n\u003cli\u003eEACH SET OF PISTONS INCLUDES WRIST PINS , SPIRAL LOCKS , ENGINE ASSEMBLY LUBE , AND HASTINGS MOLY RINGS\u003c\/li\u003e\n\u003cli\u003eWRIST PINS MEASURE .792\" O.D. ON SINGLE CAM MODELS AND .927\" O.D. ON TWIN CAM MODELS\u003c\/li\u003e\n\u003cli\u003eSEE THE ENGINE SECTION FOR REPLACEMENT RING SETS\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eKB PERFORMANCE PISTONS\u003c\/strong\u003e\u003cbr\u003eSTANDARD BORE \u0026amp; STROKE PISTON SET\u003cbr\u003eFITS KNUCKLEHEAD , PANHEAD , SHOVELHEAD 74CI - 1200CC - 3.438\"\u003cbr\u003e9:1 DOME TOP PISTON\u003cbr\u003eSTANDARD BORE\u003cbr\u003eBY: KB PERFORMANCE PISTONS\u003c\/p\u003e","brand":"MID-USA","offers":[{"title":"Default Title","offer_id":20200078213231,"sku":"62264","price":284.03,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0081\/7401\/0479\/products\/0070542_0_c159d9a0-e46c-4ad7-8f3f-188b9e8467ce.jpg?v=1575385797","url":"https:\/\/www.widowmakersboneyard.com\/products\/62264-performance-piston-sets-for-big-twin","provider":"Widowmaker's Boneyard","version":"1.0","type":"link"}