Does anyone have the actual part numbers for the later oversize inlet valves?
The 72 A65 parts book only mentions the smaller 40mm valve. Nothing regarding the 42 or 43mm ones.
SRM have 43mm ones for sale, and MAP Cycles in the US have 42mm ones, but neither state the part number.
From what I found, they are the only ones selling the oversized valves.
Cheers