Youngy Looking for a starter motor to suit a B20 engine. Even a part number for an aftermarket starter would be good. Thanks.
Spac I am pretty sure that a 240/740/940 starter will work perfectly in your OHV engine. This will widen your search options considerably.
Major Ledfoot Spac - Even B30 starters will fit too. I'm using a modern lightweight one from a 940 in my B20 build. Brand new ones on eBay for 150 bux shipped. https://www.ebay.com.au/itm/291137044300