Bloomfield

Thanks, that is really useful information. I had noticed those holes you mention in photos of Pursang pistons but wasn't sure of the purpose, and I don't have an Alpina piston to compare to. From the sounds of it it would work but maybe would result in more mixture being blown out the exhaust port. I should wait for the proper thing I suppose. What about Sherpa pistons though, or do they have a different compression height due to the shorter stroke?

Hi, this is my first post here. I have most of an M116 350 Alpina which I got for $100 20 years ago and I have been slowly gathering up some of the missing parts. The main things I still need are a piston and con rod kit. While pistons are available new, they are quite expensive. Occasionally on ebay I see listings for NOS pistons from other models such as 360 Astro, Frontera, etc. Are any of these suitable? I believe I am currently at standard bore but as the cylinder is quite rusty it will likely need a rebore in any case. Alternatively are there any more common Japanese model pistons which can work? Probably I should just save up and get the proper thing, but any suggestions are welcome. Thanks, Andy