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#11
Re: Are these A series GX or comp heads? Experts needed!
Fandatstick
Posted on: 2008/3/26 8:11
Quote:
All the A12s I've seen (in NZ) have heart shaped combustion chambers? The only A series head I've seen with anything else (almost 'hemi' like I think) was an A14 oval port but not common here (generally oval port / Heart combustion chamber.)  
#12
Re: Are these A series GX or comp heads? Experts needed!
retrorally
Posted on: 2008/4/30 15:44
I have just purchased a head . Can anyone shed some light on what type it is?
Port size 39.5 x 30 Valves 38 in, 33 ex It has no id other than nissan datsun embossed across the top near the rocker posts. It has an ali plug in the side. The small water galleries on the manifold face have been blocked with grub screws. I have read through Wiki but I'm still struggling. Head from sydney, original work done by Ron Goodman. Chambers cc at 24.8. Marty
#13
Re: Are these A series GX or comp heads? Experts needed!
ddgonzal
Posted on: 2008/4/30 17:08
That, undoubtedly, is a genuine Ron Goodman head. Probably he fitted larger valves to a GX head.
#14
Re: Are these A series GX or comp heads? Experts needed!
b310gx
Posted on: 2008/5/1 2:23
There was a Roy Goodman in Sydney for a long time, he's know located on the NSW far north coast, so you might be able to find him.He did a lot of work on minis, but would work on other motors too. More than likely it's one of his.
#15
Re: Are these A series GX or comp heads? Experts needed!
revhead001
Posted on: 2008/5/1 2:27
That head was a great buy. Top bloke too.
#16
Re: Are these A series GX or comp heads? Experts needed!
dazza1200
Posted on: 2008/5/1 13:02
the decomp head is soft as butter
look at the head bolt holes at the top worth about $1 per kg dazza
#17
Re: Are these A series GX or comp heads? Experts needed!
ddgonzal
Posted on: 2008/5/3 21:51
Quote:
the decomp head is soft as butter
#18
Re: Are these A series GX or comp heads? Experts needed!
revhead001
Posted on: 2008/5/3 23:18
When an alloy casting is fresh it has a certain hardness that you can test. After a while it looses it's hardness mainly due to being overheated too many times and as such becomes soft. It renders a cylinder head useless. The worst pitfall of buying a used alloy cyl head.
I once bought an alloy Yella Terra cyl head for a holden 6 for $$500. I was excited as. Turned out to be soft as as worth abeut $50 in scrap!
#19
Re: Are these A series GX or comp heads? Experts needed!
ROConnor
Posted on: 2008/5/4 2:52
not entiarly sure about alloy but would emagin a heat treatment company could re harden allthough it would no dout need to be remachined but thats no dificult.
#20
Re: Are these A series GX or comp heads? Experts needed!
A14force
Posted on: 2008/5/4 5:56
Feral mentioned this process donkeys ago. Something like you must heat the head to near it's melting point, for ages, then allow it to cool slowly. (I think) I think he said it's quite costly, and only works sometimes. Only worth doing to a really trick race head.
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