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Does anyone out there know the casting numbers for holden 6 heads. Or does anyone know a definate way to identify red heads? Apart from the obvious - 202 @ 186 are open cahamber, 186 has adjustable rockers, 179 is obvious as it is the only one with closed chamber and non adjustable rockers, what about the rest? I believe all the rest are closed chamber adjustable rocker type? Surely by looking at the heads or numbers you can identify a 149 from a 161 for example. Any help is much appreciated.
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There are only a few types althoughthere are probably a few more casting numbers than types and there is also the pollution red heads (from memory so correct mistakes please):
202, low comp 173 and I think low comp 138 - open chamber and rocker bridges |
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Close chamber are 138 149 161 173. and XU-1 202 186?
open chamber are 202 186 179.
low comp 173 161 149 i think are open chamber.
all 6 cyl red motors are adjustable up to HG & LC.
HQ & LJ 202 173 on, all got non adj rockers.
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Thanks HK1837, is it not right that 179 has closed chamber and non adjustable rockers? I thought the high and low comp was alot to do with what pistons where used (flat tops, dish top etc), does it apply to the head as well?
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no the 179 is same as 186 etc head. you are thinking of the 173. the 179 etc with non-adjustables went up to 71 (before release of HQ) and then all the heads were non adjustable. Also there was no cc 186 or 179 heads
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At the back of the cyl head, on the left above the number 6 exhaust port, there is usually a H or a L. H stands for closed. L for open.
Some times there is a number, i have seen the number 4. and a 9 in its place?
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At the back of the cyl head, on the left above the number 6 exhaust port, there is usually a 'H' or a 'L'. H stands for closed. L for open.
Some times there is a number, i have seen the number 4. and a 9 in it's place?
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sorry that should read
the 179 etc with *adjustables*
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im not sure that is right rosenberg as the H and L doesnt always seem to add up to that. i could be wrong but i thought i saw it discussed here
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H is high, L is low but it only applies where the compression ratio is determined by the head and not to XU-1. 179, 186 and 202 use dished pistons for low comp engine and I think 138 does too.
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Thanks guys for your input, i really thought it would be as simple as casting numbers would let you know what head it is without taking it off to look at the chambers ie 2811930 is a 202. I cant seem to find a list anywhere of holden 6 cyl head casting n
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Post the numbers you have and ill see what I can find. The H and L are the best pointers.
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Post the numbers you have and i'll see what I can find. The H and L are the best pointers.
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Hi Guys.
The best method of ID is the casting number. On all Red 6-cyl heads this can be seen without removing the rocker cover, which is necessary on Holden V8 & Blue 6-cyl engines.
Its a bit complicated because some engines were built with either |
If at first you don't succeed, just call it Version 1.0 |
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Hi Guys.
The best method of ID is the casting number. On all Red 6-cyl heads this can be seen without removing the rocker cover, which is necessary on Holden V8 & Blue 6-cyl engines.
It's a bit complicated because some engines were built with either |
If at first you don't succeed, just call it Version 1.0 |
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NO low comp 186? prefix
HR 186A
HR 186K
HK-T-G 186P
HK-T-G 186S
LOW COMP 186?
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the 186S engines had the same CR as their low-po counterparts. Lots of other things were changed but the compression remained the same
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Thanks Dr Terry for the info, does a list of these casting numbers exist? Im a bit of a collector of casting numbers and cannot find any info on them at all!
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Hi, I think the 138 piston had half the top raised higher than the other side. L C 138 had adjustable rockers from memory. Bazza
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is it possible to contribute and make a master list of casting numbers for holden 6 heads?
this could be a reference point from now on?
stuff like,
casting number for LC GTR / + XU-1 included etc.?
does anyone have this info?
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Old holdens brought on the spot, quick decision, cash paid. |
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