When i order 81mm cp pistons do i have to get my block honed to fit the new pistons? block has 80,000 miles on it.

 

BUMP!!!

 

bump

 

I would, it would help with the breaking in of your new rings.

 

Why not go oversized like 81.5mm and have a machine shop match the bore to the pistons?

 

Unlike the old days where pistons had slight variances in their size, they are now all uniform. So vs 80.93 to 80.97, they will all come at 80.97s (depending on manufacture). Your engine is most likely going to still read out at 81.00mm (assuming it hasnt been beat to hell and back), thus the pistons come ready to drop in. In the old days due to the variance in the pistons, you would need to get each cylinder bored to the exact size in order to get the proper piston to wall clearence on all cylinders.....now you dont have to.

 

Ight thanks for the help