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ROConnor
Re: Are these A series GX or comp heads? Experts needed!
#21
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useualy to harden somthing its a rapid cooling proccess, Again I'm not to sure with alloy but the Idea is to lock molicul's in an ulterd state by cooling them as rapidly as posible and if it's cool slowly they return to there original state i.e. soft, and often if you go to a hardening mob they will chuck one'off's in with larg nummber job's and do it for cash.

Posted on: 2008/5/4 8:23
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A14force
Re: Are these A series GX or comp heads? Experts needed!
#20
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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.

Posted on: 2008/5/4 5:56
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ROConnor
Re: Are these A series GX or comp heads? Experts needed!
#19
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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.

Posted on: 2008/5/4 2:52
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revhead001
Re: Are these A series GX or comp heads? Experts needed!
#18
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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!

Posted on: 2008/5/3 23:18
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ddgonzal
Re: Are these A series GX or comp heads? Experts needed!
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Quote:
the decomp head is soft as butter
Darin, can you explain, what do you mean?

Posted on: 2008/5/3 21:51
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dazza1200
Re: Are these A series GX or comp heads? Experts needed!
#16
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the decomp head is soft as butter
look at the head bolt holes at the top
worth about $1 per kg
dazza

Posted on: 2008/5/1 13:02
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revhead001
Re: Are these A series GX or comp heads? Experts needed!
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That head was a great buy. Top bloke too.

Posted on: 2008/5/1 2:27
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b310gx
Re: Are these A series GX or comp heads? Experts needed!
#14
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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.

Posted on: 2008/5/1 2:23
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ddgonzal
Re: Are these A series GX or comp heads? Experts needed!
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That, undoubtedly, is a genuine Ron Goodman head. Probably he fitted larger valves to a GX head.

Posted on: 2008/4/30 17:08
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retrorally
Re: Are these A series GX or comp heads? Experts needed!
#12
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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

Posted on: 2008/4/30 15:44
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