Ford NAA

avant 1735 · Nov 26, 2020

working on A NAA The top of the pistons have 030C stamped on top, does this mean they are .030 over? Thanks

Tim PloughNman Daley RIP · Nov 27, 2020

Doubtful. Probably a manufacturers code/part number. Why guess? Measure with mic or take to reliable shop to get verified. If you are going to do a rebuild, you want to get the block tore down and inspected/sized BEFORE you go out and out any parts.

Tim Daley(MI)

Bern · Nov 27, 2020

My guess is that it does mean .030" over. Take a calipers or inside mic and measure the top of the bore, above the ring ridge and free of carbon, to confirm.

Ford NAA

avant 1735

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Tim PloughNman Daley RIP

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Bern

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