PERFORMANCE PISTON SETS FOR HARLEY DAVIDSON BIG TWIN

• SPAWNED FROM THIS SUCCESSFUL MANUFACTURER'S LINE OF AUTOMOTIVE PISTONS
• LIGHTWEIGHT PERMANENT MOLD CAST PISTONS
• MANUFACTURED FROM HYPEREUTECTIC 390 ALLOY , CONTAIN 16-18% SILICON , AND HEAT TREATED TO T6 SPECIFICATIONS PRODUCING A STRONGER THAN STOCK PISTON
• SPECIAL ALLOY COMPOSITON KEEPS HEAT CONFINED TO THE COMBUSTION CHAMBER AND REDUCES HEAT TRANSFER TO THE PISTON ITSELF PRODUCING A COOLER RUNNING PISTON
• CAN BE FITTED WITH A CLEARANCE AS SMALL AS .00075"
• PISTON EXPANSION IS REDUCED BY AS MUCH AS 20% OVER CONVENTIONAL PISTONS
• LESS PISTON ROCK , BETTER RING SUPPORT , MORE DURABILITY AND BETTER RETAINED COMPRESSION FOR MAXIMUM POWER
• THE 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
• EACH SET OF PISTONS INCLUDES WRIST PINS , SPIRAL LOCKS , ENGINE ASSEMBLY LUBE , AND HASTINGS MOLY RINGS
• WRIST PINS MEASURE .792" O.D. ON SINGLE CAM MODELS AND .927" O.D. ON TWIN CAM MODELS
• SEE THE ENGINE SECTION FOR REPLACEMENT RING SETS