its a super limited run for 2006 where they made blasters 250s, these parts were made readily available so every other toolshed on the face of the planet could also have a 250 blaster. also for ever .010 of an inch you bore it out, you get to add 10cc!!!!!!! now....but every mm is worth 100cc's if you go 1.5mm over on that 250 blaster... HOLY sh*t! you now have a 400 blaster!!!!!
man people can be dumb.....