Re: piston rings?
One thing that is over looked using a fish scale was the block plate honed or was the scale test done on cylinders that were not plate honed ??
If the block was not plate honed once the heads are installed not its a whole different ball game as you dealing distorted cylinders ( Not Round cylinders )
I plate hone all my blocks which is more important with OEM blocks as they are pretty frail.
Do a search on Torque plate honing.
I have seen circle track engines that were not plate honed and even after 2 or 3 years running still no ring seal and poor leak down numbers.
Ring can never break in when cylinders are not round.
Fish scale tests depends on cylinder finish.
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