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i just got a head which was advertised as yella terra but im not sure.it still has the holden raised letters(aint this to be grinded of?)plus when i look up the numbers y t seem to start with 743.mine are 2811.can someone help me,i nead to no if ive been done before i get back onto him about it.ps its got the yt valvues but head not sure.any help would be good.cheers,shaneo.
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quote:
Originally posted by Hell Raiser
i just got a head which was advertised as yella terra but im not sure.it still has the holden raised letters(aint this to be grinded of?)plus when i look up the numbers y t seem to start with 743.mine are 2811.can someone help me,i nead to no if ive been done before i get back onto him about it.ps its got the yt valvues but head not sure.any help would be good.cheers,shaneo.
check ya sparkplug threads.742**** & 743****bigger holes are 186, 161 etc. smaller holes 281****,are 173 & 202
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ill check.but the guy said it was 186 with the numbers 2811
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weren't most YT heads just standard heads with some work done to them?
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yeah holden heads.but i think yella terra grind the holden lettering of(which this hasnt got),plus i think they get rid of some of the bushs?plus work on the ports.im just trying to work out if this has had work done to it besides the yt valves.
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There are YT modified Holden heads, and YT "style" heads because it's a simple, effective style of mod that many porters used. YT used closed chamber heads with pedestal rockers and if the valves are original will have YT stamped on the face. It's thought YT/Perfectune developed the style originally for mass market but i know AJE in Greenacre, specifically Arthur himself was involved very early on in Red performance; rumour has it YT tried to get him on board. Typically the casting around the head bolts was cut out and replaced with a tube and the ports were opened up around the back of the throat with a plunge cutter then mildly smoothed. Edited by user Wednesday, 18 April 2012 6:43:39 AM(UTC)
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quote:
Originally posted by dirty davo
check ya sparkplug threads.742**** & 743****bigger holes are 186, 161 etc. smaller holes 281****,are 173 & 202
Not strictly true davo. There are many 1971 HG 161 & 186 engines fitted with the 281xxxx cast heads, but they are machined for the older style larger spark plugs & stud mounted rockers. I'm not sure when the later casting number was put into production, but my guess is Feb 71. Dr Terry |
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all yella terra heads will have a date stamped on the back of them day - month - year.will have smaller stud post than a standard head at least half the size. if they don't they are not the real deal. Edited by user Sunday, 10 June 2012 9:49:30 PM(UTC)
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