340 engine repair/build questions

TheRacerDave said
Had this same issue with a SBC I was working on. Ball hone first as it won't increase the bore diameter.* A little discoloration won't hurt anything, but using magnification look for pitting. If necessary go to a rigid hone and take the absolute minimum to remove the pitting, no more than .001" with those cast Silv-O-Lites.

Going +.010 over the current 4.070" (std +.030) would most likely clean it up; unfortunately the only way to get a 4.080" (+.040) piston is with a custom Diamond, Ross, etc. $$$

* My ball hone is 400 grit for moly rings; coarser grits may remove metal.

Imagine my surprise, I didn't know they had stopped making .060 pistons for 340.

I gotta coupla sets of .060 pistons sitting on a shelf, and a few in engines.

I'ma gonna start collecting worn out +.040 - 340 blocks .

Just for reference, going an additional .020 is a removal of only 0.010 of material from the cylinder wall.
10 thou off the wall. . . - alum foil is 6.5 thou.
So you'd be removing alum foil thickness from the wall .
Things are relative . .

Good luck .