WRIST PIN FIT?

Hi Folks

So I tore into a 1970 340 that I picked up knowing that is was .030 over TRW 2332P. The bores were pretty nice with no wear, and the rod and mains were .010.

Unfortunately, the main and rod bearings looked like ****, but the crank looked ok (to be determined).

What I found, regarding rods was that whoever built this thing used pressed in pins, and I found 2 rods with different forging numbers. 1 of the assemblies looked really good. The rod rocked back and forth between the skirts, and the pin slid sideways back and forth to the point where the piston contact with the small end stopped the movement. On the other 7 however, all of the ends of the pins were bluish from heat and the rod/pin would not slide back and forth in the piston, and it took a lot of effort to rock the piston from skirt to skirt.

My question is.....how are the pins supposed to fit in the pistons? I know that they are pressed into the rod, but should they be a "slip fit" in the piston? Even without a rod, the pin needs a light press to remove them from the bare piston.

I am hypothesizing that the builder may have ruined the piston holes on a press while trying to assemble everything.

What are your thoughts?

Thanks