515573

[Douglas Braun & Nadia Papakonstantinou <dougnad@bellatlantic.net>]

Hello,

I have a head with part number 515573 stamped on it.
Can anyone look this up and tell me what model it
is from, and hopefully the compression ratio?
 From the valve sizes, it appears to be a MK III or IV,
but my MK IV book does not list it.

Thanks,

Doug Braun
'72 Spit