B33 valve rockers

[Greenfield]

I'm in the process of overhauling the head on my 1950 B33 (iron head) and notice that the rockers are cast with the numbers 65-1101 and 65-1103. Draganflys list them as 65-1100 and 65-1102. Does anyone know if there's any difference in these rockers?
Cheers

[martinh10]

I've just had a look at my spares and they are identified as 65-1101 and 65-1103. I believe these are the bare casting part numbers which become 65-1100 and 65-1102 when machined. The 1954 B31/B33 parts catalogue page 10 lists them as 65-1102 (inlet) and 65-1000 (exhaust). The inlet part number is correct but the exhaust is a typo which BSA correctly list as 65-1100 in the index (page 114). 13 shillings (65p) each in 1954 by the way - still, I suppose that would get you about 10 pints back then!

[Greenfield]

Cheers Martin
It was worth checking before reassembly.

[Derek996]

The number on the castings is usually one digit away from the part number. I have a ZB32 GS cylinder head on which the cast in number is 65-1301 but the part number for the Clubman's version 65-1302 and for the B32A and GS trials version it is 65-1300. The difference is in the inlet port and valve seat sizes but they are all based on the same casting.