Herald 1200 cylinder head differences pre / post 1966

[Colin Lindsay]

I've been asked why Herald 1147 cylinder heads are advertised as being pre 1966 or post 1966 and can't find a definitive answer.

I have two different types of my own; the earlier having the long water pipe running through the head and the other being a revised cooling system with no pipe and different core plugs. Is this the sole difference, or were there other changes that would affect a rebuild? Early head on left, later one on right.

  

 

 

[Casper]

GA178101E Nov 1964.  Hot Cam (12/50 spec) introduced.  I thought this was when the bucket core plugs were introduced.  Not aware of any other head changes.

GA178624E May 1965  Brass tube fitted in head

C.

[Colin Lindsay]

1 hour ago, Casper said:

GA178101E Nov 1964.  Hot Cam (12/50 spec) introduced.  I thought this was when the bucket core plugs were introduced.  Not aware of any other head changes.

GA178624E May 1965  Brass tube fitted in head

C.

Thanks - I think the brass tube is the v-shaped bit you can just see in my early head, but this one is from 1962.

Some retailers and reconditioners are making distinctions between pre 1966 and post 1966 - NOT 1967 when the 1360 head came in - so I'm trying to discover exactly why. There appears to be no difference in price for the ones I've checked so far, so it can't be too drastic a difference, and may just be the improved cooling.