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Yes use the 225 rings with the 225 piston's and they do fit the F7r block fine, I used a few years back Wossner High comp's from an F4r in an F7r without any issue dropped straight in all tolerances and clearances were fine
Indeed the modern wossner and JE pistons do but if you go back 10 yrs and look at the wossner pistons they didn't just simply dished. You will be fine there are many a turbo project out there with just skimmed pistons or some have been dished and and run fine.
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