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Does anyone have any info on the AN dome top 1800 pistons?

Dome height, dome CCs, etc...

I have a contact who develops pistons, and can also make reproductions. As far as I know, these were last produced by NPR in the 1990’s, and I would love to have something similar made.

Thanks!

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I have a set, halfway Installed . They have steel stiffeners in them. No brand markings I'm debating whether to use Q heads with them. I could get some rudimentary measurements.

That would be cool. Thanks!