Colin Lindsay Posted October 2, 2019 Report Share Posted October 2, 2019 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. Link to comment Share on other sites More sharing options...
Casper Posted October 2, 2019 Report Share Posted October 2, 2019 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. Link to comment Share on other sites More sharing options...
Colin Lindsay Posted October 2, 2019 Author Report Share Posted October 2, 2019 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. Link to comment Share on other sites More sharing options...
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