W2 Head ID

I have a set of W2 heads that have P4532693 cast into them. Can anyone help identify exactly which head it is? They have the bolt in rocker stand so I am assuming they are the race head. 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