I drove to a machine shop in Mäntsälä with my block and heads to have them checked. They took a quick measurement of the cylinders and said that they had as much as 0.016 to 0.018 inches of wear. Way too much to be fixed by just honing. The block must be bored and I'll have to get new pistons.
My heads were a bit better. The machinist said that the valve guides were not too worn yet and the heads did not need a complete rebuild. I'll have to decide if I'll use them or the other, already rebuild heads I have.
Now I would have to get the pistons before the block could be bored. The machine shop did not have time to work with my parts before January anyway so I had a few weeks to buy them. After a few calls I was suggested to order Sealed Power hypereutectic pistons and moly rings as I was not building an engine with high power level. They were 0.030 inches oversized and should easily be strong enough.
One bad thing with them was the large valve reliefs. They would drop the compression ratio a bit. Maybe about half point from the original 9.8:1. I'll know the final ratio when the bottom end is back together.
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