Hi Spooky!!
All the identification I have on the slug is when I invert it Manley and 49116 show up .
There is no 030 or 040 on the piston head making it a 355 or 358 c.i. engine.
Domes are way up there and the piston pins are held in by circlips. Lad I got them from ran a front engine dragster with these, but he died out a couple of years ago. To me they are 040 OS as I measured perpendicular to the pin hole maybe an inch down from the top of the piston. I have a few old catalogues but no Manley.
Thanks for getting back!
Ted
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