I seem to recall reading that Yella Terra Heads, have the Holden castings on them? Is this correct?
If so, how do you identify a real Yella Terra, from an old holden head that has just been painted yellow?
How to identify a Yella Terra head
Started by
_jklumpp_
, Jun 13 2006 09:19 PM
15 replies to this topic
#2
_shayne_
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Posted 13 June 2006 - 09:21 PM
they have YT on valves, ported and double valve springs
#3
_Eddie_
_Eddie_
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Posted 13 June 2006 - 09:26 PM
I asked the same question about 6 months ago on the old site (maybe u saw it there??) The answer is yes, YT just use the Holden head and don't touch the stamping numbers. YT heads, depending on what stage it is, are ported and polished which basically means the inlets are bigger than normal - if you don't have an eye for it, post a piccy up here and one of the nice lads will be able to help. Also, YT valves are usually stamped with 'YT' on em so thats another indication...although you need to take the head off to check that I think.
#4
makka
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Posted 13 June 2006 - 11:18 PM
take off the manifolds and get a pic, if the posts in the intake ports have been removed and replaced with some tube, you have a YT or similar head
#5
_73LJWhiteSL_
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Posted 14 June 2006 - 12:43 PM
Peter UC told me ages ago about the posts being replace with tubes in the inlets. Does anyone have some pictures showing a standard head and a yella terra head? If they could post them that would be cool.
Steve
Steve
#6
makka
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Posted 14 June 2006 - 01:06 PM
it should look something like this
shitty pics, but theyre what I could find quickly
shitty pics, but theyre what I could find quickly
#7
makka
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Posted 14 June 2006 - 01:06 PM
that second head is on ebay for $75 at the moment
#8
_Yella SLuR_
_Yella SLuR_
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Posted 14 June 2006 - 09:17 PM
God, feel like I've posted this 1,000 times now. Think it must be on the old site. This is all from a 308 perspective by the way, not sure about variants on the six heads.
Early Y/T heads have no identification at all on them, were painted Holden Rocket Red, Holden sill cast into them, no Y/T on the valve faces. I don't believe they came in Yellow till the 80's, except for the adverts. The only way to identify the early ones are much larger valves, nearly double standard, modified combustion chamber to take the bigger valves (valves about 50% bigger than the L34 valves even), and the valves have the black tuft-riding on them. The inlets have minimal machining, but you'll find that there is no sharp casting edge in the inlets/outlets.
A set of early 308 Yella Terra's with hardened exhaust valve seats.
Later Y/T heads actually had the valves with Y/T cast into the face.
Early Y/T heads have no identification at all on them, were painted Holden Rocket Red, Holden sill cast into them, no Y/T on the valve faces. I don't believe they came in Yellow till the 80's, except for the adverts. The only way to identify the early ones are much larger valves, nearly double standard, modified combustion chamber to take the bigger valves (valves about 50% bigger than the L34 valves even), and the valves have the black tuft-riding on them. The inlets have minimal machining, but you'll find that there is no sharp casting edge in the inlets/outlets.
A set of early 308 Yella Terra's with hardened exhaust valve seats.
Later Y/T heads actually had the valves with Y/T cast into the face.
#9
_Yella SLuR_
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Posted 14 June 2006 - 09:37 PM
Forgot to add, despite the fact they weren't originally painted yellow, alot of people painted them Yellow so you could see they were Yella Terra's at the time. I know alot of my mates did (Yellow Dolly). Otherwise on the car they looked like plane jane heads.
#13
_Yella SLuR_
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Posted 15 June 2006 - 09:30 PM
Wasn't there a warning on Ebay about taking pics for the net in the nude? Something to do with a Dining Table for sale and a mirror on the wall.
#14
_Barman_
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Posted 18 June 2006 - 07:37 PM
Thanks Guys
I should have read this before postin my question, Looks like ive got YT heads
(and got them realy cheap $200 for a complete 308 trimatic)
The lad also told me its got a shift kitted tranny too but its sad
Thank Baz
I should have read this before postin my question, Looks like ive got YT heads
(and got them realy cheap $200 for a complete 308 trimatic)
The lad also told me its got a shift kitted tranny too but its sad
Thank Baz
#15
_just_matt_
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Posted 19 June 2006 - 04:01 PM
i have a high compression head with 12 port conversion, is this a common converson and does it give many (if any) hp?
#16
_just_matt_
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Posted 20 June 2006 - 03:21 PM
does it have anything to do with fuel injection?
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