Had this posted in the Q/A section it was suggested to try here also. I have a set of closed chamber W2 heads that have P4532693 cast into them which seems to cover a few different versions. Can anyone help identify exactly which head it is? A google search came up with them being...

P4532693 = P5249769

59 degree tappet

65 CC closed chamber

18 degree valve angle

Anyone confirm or deny this info? They have the dual bolt pattern on the exhaust side if that helps.
Thanks

It's definitely a 59º head and the P4532693 casting was used
for heads with different part numbers.(W-2) Checking the chamber
volume is the only way I could tell. I'm not sure if the 65cc head
had a different chamber shape or not. Here's a 55cc W-2 with the
same casting number. I'm sure, it's either the 55cc or 65cc verision.

Thanks for the info I am going to CC them to see for sure.

Those look like the 55cc version.