That is a siamese block...therefore it should retain it's column strength if done properly. >>>IF DONE PROPERLY.<<< I'd poke around and find a competent machinist and let him tell you what the dimensional limits are but, The better Darton sleeves can go pretty thin and hold ...IIRC .080 wall.
SO...it's very conceivable that you can put 8 sleeves in it IF IT'S REQUIRED. Do you have the sonic #'s for ALL cylinders?

Last edited by HardcoreB; 12/02/20 02:03 PM.