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castellan Offline
#21 Posted : Saturday, 23 August 2014 12:28:02 AM(UTC)
castellan

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all X2 and 161S, 173S, 186S and HT-G 186 auto get the 7428531 cam
In 23/45
Ex 50/10 lift 0.338

2822072 cam is a LC XU-1 Bathurst cam
In 37/74
Ex 78/34 CK Block prefix.

XH could only be X for some special and H for HYD

STD cam is 2818929
In 15/45
Ex 50/10 lift 0.338

2815739 is a LC XU-1
In 29/57
Ex 64/24 lift 0.345
HK1837 Offline
#22 Posted : Saturday, 23 August 2014 3:42:17 AM(UTC)
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Not quite right, trimatic 186S Holdens got a different cam 7420034.
All HT 186 get the 7428531 cam until trimatic replaces powerglide then from then on the trimatic 186 gets the 7420034 cam but the manual kept the 7428531 cam.

LC parts catalogue does list 2822075 (says stamped XH on the front in the text) against 186X (agree this must be the 8/71 LC XU1), but also lists it as the cam for the 2850S which seems silly.
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castellan Offline
#23 Posted : Saturday, 23 August 2014 8:06:44 PM(UTC)
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186X is the first month LC XU-1 with the 075 cam.
The 3100X are the LC XU-1 ones after that first batch.
The two cams are the same only the 3100X is a retarded by 6 degrees to get more power.
So it could be that the cam people put an X on the cam to reference what it is as to the timing, so XH could be for advanced or HX could be for retarded.
Now the reason I say that is I know with ford they do the same thing with cams.
hq ss Offline
#24 Posted : Saturday, 6 September 2014 8:39:21 PM(UTC)
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If anyone is interested this is what Wade were selling as there LJ Bathurst cam in 1996.






This is a rough graph of the cam.



Has anyone ever graphed any of the original cams at all.
HK1837 Offline
#25 Posted : Tuesday, 9 September 2014 8:01:37 PM(UTC)
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I did the VK EFI cam in the late 80's
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8D11PCH2 Offline
#26 Posted : Friday, 7 December 2018 7:19:28 PM(UTC)
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Originally Posted by: castellan Go to Quoted Post
I was looking through a XU-1 book and this is my take in then .
The first month or so they came out with a cam p/n 2815739 then from 3/9/1970 this cam was retarded to give better performance up top.

The so called Bathurst LC XU-1 from 16/7/71 that only people in the know could get she has a bigger cam P/N 2822075 and she got the CK block prefix and had more power = 180 HP

The LJ 202 was on sale from 11/2/72 she gets a cam P/N 2823364 now this cam is the same as the 186 Bathurst but it is advanced for better street driving I would say.

From 29/8/72 we get the first LJ Bathurst special with a bigger cam P/N 9929247 and only 200 were made for people in the know.

From ?/8/73 another Bathurst special cam out and she gets a bigger in take valve better pistons rods same cam as 29/8/72

Anyone want to put your 2c worth in.


I know this is an old thread but I only found it recently and thought I just add my 2 cents.

Hi Castellan,
Good to finally see someone actually thinking about the XU-1 camshafts.
You are mighty close with what you have posted.
The LC XU-1 camshafts were retarded by 6 deg from the SOP. In that History of XU-1 book the claim that the LC XU-1 camshaft grind was changed slightly but the part number 2815739 stayed the same is pure BS. There was no physical change to the camshaft whatsoever.
HK1837 Offline
#27 Posted : Saturday, 8 December 2018 5:44:45 PM(UTC)
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Which is pretty normal in GM world. They only really ever used a few grinds and GMH were the same. They seem to retard or advance them if they can rather than have a different part.
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castellan Offline
#28 Posted : Saturday, 8 December 2018 6:12:26 PM(UTC)
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Originally Posted by: 8D11PCH2 Go to Quoted Post
Originally Posted by: castellan Go to Quoted Post
I was looking through a XU-1 book and this is my take in then .
The first month or so they came out with a cam p/n 2815739 then from 3/9/1970 this cam was retarded to give better performance up top.

The so called Bathurst LC XU-1 from 16/7/71 that only people in the know could get she has a bigger cam P/N 2822075 and she got the CK block prefix and had more power = 180 HP

The LJ 202 was on sale from 11/2/72 she gets a cam P/N 2823364 now this cam is the same as the 186 Bathurst but it is advanced for better street driving I would say.

From 29/8/72 we get the first LJ Bathurst special with a bigger cam P/N 9929247 and only 200 were made for people in the know.

From ?/8/73 another Bathurst special cam out and she gets a bigger in take valve better pistons rods same cam as 29/8/72

Anyone want to put your 2c worth in.


I know this is an old thread but I only found it recently and thought I just add my 2 cents.

Hi Castellan,
Good to finally see someone actually thinking about the XU-1 camshafts.
You are mighty close with what you have posted.
The LC XU-1 camshafts were retarded by 6 deg from the SOP. In that History of XU-1 book the claim that the LC XU-1 camshaft grind was changed slightly but the part number 2815739 stayed the same is pure BS. There was no physical change to the camshaft whatsoever.

The book says that the grind is changed and same PN. ?

As I am to believe is that the std LC XU-1 first came out and then later the timing gear must of been changed to make it advance by 6 deg. so the timing gear must be a different PN to of done that, or is it that the original is just BS.

Why would Holden of come out and did such, I would think. I have played with cam timing and to set the timing out 6 deg is just madness on such a type of cam, if it's been ground for a effect, playing with the adv or retard is only due to other reasons to do as such, but such is not the point on a cam to be played with like that.
lets say that I would not recommend doing such, so I find GMH to do such would be odd.

I know of a USA 351 Cleveland that such a grind was done but that was for emissions reasons only.
HK1837 Offline
#29 Posted : Saturday, 8 December 2018 6:31:38 PM(UTC)
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They did it with the VK EFI cam too, retarded it by from memory 6deg.
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8D11PCH2 Offline
#30 Posted : Saturday, 8 December 2018 8:12:28 PM(UTC)
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No use bothering with what the XU-1 book says when it is incorrect.
The LC XU1 used the same camshaft gear from the SOP to EOP.

The LC XU1 Advanced Service Bulletin H326 listed the timing specs as:
Exhaust Opens BBC 64 deg
Exhaust closes ATC 24 deg
Duration 266 deg *

Inlet Opens BTC 29 deg
Inlet Closes ABC 57 deg *
Duration 266 deg *

Service Bulletin H330 was issued in September 1970 to correct the timing specs * listed in H326 (see copy of dealer service letter on page 132 of Fiv's XU1 book)
Exhaust Opens BBC 64 deg
Exhaust closes ATC 24 deg
Duration 268 deg *

Inlet Opens BTC 29 deg
Inlet Closes ABC 59 deg *
Duration 268 deg *

Another Service letter was then sent in October 1970 to correct the timing specs listed in H326 and H330.
These are the figures you see written on the September dealer service letter on page 132 of Fiv's XU1 book.

I'm surprised that FIV didn't claim the LC XU1 camshaft grind changed twice making it three different camshafts all with the same part number.
castellan Offline
#31 Posted : Sunday, 9 December 2018 8:19:17 PM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
They did it with the VK EFI cam too, retarded it by from memory 6deg.


Bigger cam I believe it was than the carby VK.

Boy them 3.3L EFI got along well in the day and the 3.0L Nissan engine lacked the torque of the 3.3l EFI, until it got wound up and then took off.
HK1837 Offline
#32 Posted : Monday, 10 December 2018 5:25:58 AM(UTC)
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Yes it was a bigger cam but it was retarded in the.timing gear.
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