Yes, Roger, they are indeed round and parallel. At 2.65in they are essentially 0.090 oversize. The oval and taper specs from the hepolite catalogue (1952 version) looks kind of challenging, but then, thinking about it, I guess shaping pistons in this way has been going on for around a century so it should be reasonable to expect a machine shop to be able to undertake the work.
My other thought: is the depth of the ring grooves the same for different sizes of piston, ie., std to 0.060 over?
1948 Sq4 basket job - help!
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