186 rebuild, Oracle advice
#51
Posted 05 March 2021 - 09:04 PM
early Holden nut
#52
Posted 05 March 2021 - 09:05 PM
Edited by S pack, 05 March 2021 - 09:08 PM.
#53
Posted 05 March 2021 - 09:33 PM
early Holden nut
#54
Posted 05 March 2021 - 09:45 PM
#55
Posted 05 March 2021 - 10:52 PM
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#56
Posted 06 March 2021 - 06:50 PM
https://www.gumtree....opytopasteboard
Another two or three 179/186/149 by the text:
https://www.gumtree....opytopasteboard
#57
Posted 06 March 2021 - 07:10 PM
Will be going new pistons in the 179 with auto crank I know that much.
161 head is in usable condition with a valve grind but the cam needs the double spring set up I feel. May just tidy up the 202 head for now.
early Holden nut
#58
Posted 09 March 2021 - 08:18 PM
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#59
Posted 27 March 2021 - 09:06 AM
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#60
Posted 27 March 2021 - 09:09 AM
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#61
Posted 27 March 2021 - 09:56 AM
Shop didn’t like the valve seats on the 202 head. Now have a 186 head to have a look at during the week. I could use one of the two 179 heads I have but they don’t allow use of the later thermostat housing with separate outlets for the manifold.
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Pretty sure it is a only a matter of drilling two extra holes and tapping a thread in one of them to modify the 149 & 179 head heads to accept the later thermostat housing.
I'm sure Dr Terry will be able to confirm if it can be done.
#62
Posted 28 March 2021 - 09:08 AM
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#63
Posted 28 March 2021 - 09:39 AM
Just tidier with the hoses. They are messy enough already by the time you run heater as well. Planning a trip Adelaide Toowoomba in June. I want a heater.
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#64 _Lazarus_
Posted 29 March 2021 - 07:48 AM
I saw something on this a while ago and looked at my blue/black heads and they they don't seem to have it ? Maybe only 161 / 186 ? My YT 149 head doesn't.
#65
Posted 29 March 2021 - 08:17 AM
early Holden nut
#66 _Lazarus_
Posted 29 March 2021 - 08:39 AM
But I thought only 161 and 186 were water heated. The 173 in my UC is exhaust heated.
#67
Posted 29 March 2021 - 09:08 AM
XT4 and XT5 engines are exhaust heated, these started in July 1976.
#68
Posted 29 March 2021 - 10:24 AM
early Holden nut
#69
Posted 29 March 2021 - 10:41 AM
#70
Posted 02 April 2021 - 04:36 PM
early Holden nut
#71
Posted 02 April 2021 - 09:41 PM
Most companies that reco heads stamp the back of the heads with their own number system.
#72
Posted 02 April 2021 - 10:27 PM
early Holden nut
#73
Posted 11 April 2021 - 05:09 PM
TIA
Clay
early Holden nut
#74
Posted 11 April 2021 - 07:43 PM
High volume pumps are not needed for most standard-mild even hot Holden 6's.
They take more hp to turn them.
They can produce excessive high pressures on engines with tight bearing clearances that can possibly cause bearing damage.
A stock pump with standard clearances is more than capable for most engines, turboing being the only exception that comes to mind
Starving the bottom end? would be more to do will the poor drainback ability from the rocker cover especially after a long hard thrash & crankcase pressures holding oil up in the rocker cover.
Personally a stock pump in good condition is fine, especially with normal bearing clearances.
#75
Posted 11 April 2021 - 10:09 PM
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