225 Build for the A100

Yup. Sealed power.
And I've heard of others with similar dismal "down in the hole" numbers using those pistons, the build of the 67 dart motor by that community college in PA amongst them, and there was a magazine writeup across a few issues of a 66 dart that they had done upgrades on in each issue that told of the same issue. With no deck machining both told of 0.210"ish in the hole numbers at TDC on their engines.