alright im looking to build my d16 because its different. lol i know it doesnt make much power but its what i want i would like to go high compression running on the bottle im trying to figure out what pistons i should use should i stroke the motor? im going to build the head but im not sure if i should keep the y8 head or go to z6 not sure what the difference is any help would be appreciated let me know asap i would like to get the build going as soon as possible.