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Guys
I just had a quick question about a red 6 head I have here that another forum member was interested in for a low comp 202. I always thought it was just a mildly worked 179/186 head. However, I went out to the shed tonight and checked it out to see exactly what it was so I could advise if it would be OK. It's part number is 2811930. According to all of my parts manuals, the only engines ever fitted with this head were in the LC Torana range, and were the CB and CC prefixed 138 and the low comp 173. Does anyone know if this head is any different from a standard 186 head?? I always thought the low comp 161 and 173 head was the same as the 179 and 186 head, and had the same combustion chambers as a 202. Anyone have any ideas?
This head would appear to be perfect for a mild 202, unless something drastic is different. It has the inlet posts removed, very slight porting, slightly larger valves, conversion to 172/202 rockers on original 186 studs and guide plates. |
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Hi Byron.
AFAIK the 2811930 casting is a normal HQ/HJ/LJ/LH 202 head, which is also used oh the Lo-Comp 173. Not sure about the 138 though.
This head originally had the 'fixed' style rocker gear.
Dr Terry.
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Casting number and part numbers on heads are not the same.
Warren
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Terry, according to the HQ parts manual it's not, but AFAI always thought they were the same. I don't know why Holden would have given a different part number to the HQ 202 head though, unless it has something to do with the L (for low comp) cast into thi |
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Hi Byron.
My experience is the same as Warren's, the casting numbers & part numbers are usually different.
All the block & head numbers in my records are actual casting numbers off the items themselves.
Dr Terry. |
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When we did the research for the book we looked at heaps of cars that had never been molested and Ben did find a late HG sedan with a 186 engine and a 202 adjustable rocker head on it.
The L on the head cannot mean low compression as the 202 had differ
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Warren,i found that to be interesting reading,as ive always been led to believe that the L means low comp,and the H,which ive seen far less often,stands for hi comp.any idea what the H stands for?
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Again, I've learnt something new. This means that the head I have will be OK for a 202.
Perhaps the L and H do mean low and high comp, but in relation to the engines that use a different head for low comp? This would mean all 202's would have a L head (b |
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