just to add to this,
i got scott's 5k and it doesnt have flat top pistons, its running the dished d shape pistons that my other 5k i have has.
the 5k i compared it to has the lugs on no 1 and 4, 150mm push rods, d pistons and a small amount of combustion space in the head.
so this means that it is running the 22cc psitons and requires a small amount of space in the head for combustion.
now the question,
i also have a 4k but that has a large combustion chamber in the head.
the 5k from scott had a large compession area in the head which had been shaved down to decrease the area.
do i use a dished piston head from a 4k or will i have to use a d piston 5k head.
i have been doing some searching and i think as long as i don't use a flat top 4k head (as that will increase my combustion chamber size too much) i will be ok?
i thought i would just add to this thread instead of starting a new one.
thanks chris