amal monoblock 376/2, restored, 1 " bore , bsa b31 1955-56 pilot 30, slide 3/5, main jet 260, needle jet 106, all correct for the above model years, if you require any changes, jetting slide etc, or any other changes, just message me, complete apart from no choke/air slide.however if you require a choke, let me knowe, before paying, so i can ad this to the listing, as i some times i have one avaiable, at £20 extra, please note due to the age off this carb, it will have some ware and age patina, its only a cosmetic restoration, with some new, and re-plated parts,thanks for looking,