Keep sticking pistons on 600 ves i'ts a four corner stick no burned edges.sled has rugland twins and rugland heads and tempa flow.running two sizes bigger mains than what is recommended. put on 30 miles on and of gas never holding it open for more than a few seconds. seems to happen when going 60-70 then open it up for short distance(100 on speedo) when slowing down not completely letting of gas. motor will shut off sticking piston. but not every time and not always same piston.running 93 octane with octane boast and in regular fuel setting. any ideals please getting real $$$$$$. bleed coolant good also not running hot on temp gauge needle in middle of gauge. egt's never go over 1270's probes are 7 inches from piston skirt.