BSA Big End Assembly. 1928-31
BOA-B2. 27-1201. 27-217.BSA Big End Assembly. 1928-31. SV models.
B28, B29, B30-3, B31-1
Con-rod casting No. 27-1201. 27-217.
OHV Mod. 1928-31
L28,L29,L30-11,L31-6
Con Rod Casting Number 15-1818
Some of these engines were fitted with bearings ref. B3
Made in England