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you might be right rust bucket it would be good to know someone who worked in gmh foundry or yella terra. |
Trevor Delarue |
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I recon a bead blast into the intake ports will reveal slip-in dividers, I have the exact same head up in my loft. It dates back to the early 80's and was a popular mod back in the day. Clean up the ports and you will see a parting line at the port wall/ divider interface.
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I mentioned the dividers earlier. |
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took head to head repair shop today had port cleaned up there is no parting line any where to be seen,they said port dividers and head are cast as one,regards. |
Trevor Delarue |
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It is a Blue or Black motor head.
I've seen this before - It's a Technique called "Cold Welding"
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quote:
Originally posted by trevdel
I am only after information on this head, it is quite obvious you don't know what you're looking at. I am not trying to fool anybody.
It's quite obvious as it sticks out like dogs balls. Show us a photo showing the ports and the combustion surface in one. The head at the top in 841 is not one of the heads in the others. And i am not looking at the head surface it the side of it in the photo it has no blue shape at all on the spark plug side like the blue have. Get sick of people trying to pull the wool over ya eyes bro. Prove it ! as you have no credability on this forum your just new and we don't know if your just a joker. sorry to say but them photos don't prove anything at all. Edited by user Monday, 5 March 2012 9:57:22 PM(UTC)
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it,s of a speedway car so it,s got to be worth 1.1 million i reckon.....
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ha i was right you do not have a clue what your looking at or what your talking about.all i want is info on this head and all i get is a dick head. |
Trevor Delarue |
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quote:
Originally posted by trevdel
ha i was right you do not have a clue what your looking at or what your talking about.all i want is info on this head and all i get is a dick head.
I gave you an answer - It's a regular 12 port Commodore Head and the water ways have been Cold Welded. A process of drilling out the water holes round, heating the head to about 600 degrees uniformally and inserting cast iron machined round plugs with a slight taper that are 6-12 thou oversize of the drilled holes. Before these plugs are inserted, they are dropped into liquid nitrogen for about 30 mins to reduce their size. Once the plug is introduced into a drilling, they are lightly tapped with a small hammer to lock solid into the hole. After the head is cooled back to it's normal state, the plugs form a seal as good as any hotmetal weld, but with far superior penetration and sealing capability. The Head can then be surface ground flat, and it looks just like the inserts were never fitted and they don't fall out once they are in if done properly. It's the same process used to fit Hardened valve seat inserts into combustion chambers.
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The trouble is trev, you seem to know so much about this head im confused why your asking here???????????
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Another photo is asking to much. trevor delarue.
You see some people try to play stupid games and i get only diddly from you, so come on.
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As i thought just full of it. poor trev caught out.
I think he is just old mate "Tuff 250" coming back for revenge.
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did you see the head has holdeb cast onto it but looks like casting number removed??????
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