Looked over the pistons and bearings. Everything is made in Japan and appears to be of the highest quality. I was hoping to see made in USA but no such luck.
The pistons have some mind of a coating on them, but not the entire piston, just around part of the skirt. I imagine that would be the critical area.
@Twisted Steel Performance I imagine this must be a scuff coating of some sort, maybe until the piston warms up and gains its full round, from an oval configuration.
I dont see in the book any spec for piston to cylinder wall clearance, I’ll do some more reading, it might be in the inspection of components writings.
I remember a 400 Dodge V8 I once rebuilt, got the block and pistons with rods back from the shop after they was bored. I always would double check clearances. I glanced at the spec sheet in the motors manual, I think it said one and a half thousandths. I got out the feeler gauges and slid the gauge down the bore, went to slide a piston along side of it, man, mighty tight. I called up the old timer machinist and explained the situation to Him. He asked if I had the book handy, yup, he said look at the spec, I did, He the said, see that little star for a foot note, yup, one and a half thousandths, with a nine pound pull on the feeler gauge.



That was the tightest fitting pistons I ever did install. That engine had well over a hundred thousand miles kn it the last I seen of that truck and it was still running strong and not a sign of oil comsumption.


