i have rebuilt about five of these diesels. only once did we have to do any pistons. if they measure out ok then they are ok to use. replacing the sleeves and reusing the pistons is less expensive than boring and buying bigger pistons. and better imho.

the block should be trued to the crank too (they twist).

then you install the sleeves and bore it so that they are perpendicular to the crank line and hone to fit the pistons.

actually at that mileage you really probably could leave the bottom end alone and just do the head. often at that mileage the bearings and bores are fine...if the engine has had good care.

good luck

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.