107 replies to this topic

[Bazza]

Hi all

I am finding this all very interesting.

Am I correct in assuming that the '72 Bath cam referred to in the Antoniou book as the HX is actually the XJ and the HX/XH is the standard cam dating from early '72?

We have a couple of examples of HX/XH cams being fitted to '73 Bathurst cars - I find this very surprising since according to the Antoniou book - the '72 Bathurst cam became the standard cam thereafter.

Maybe the truth is somewhere in between? and oh, don't believe everything you read.

Bazza

[Bazza]

Do we know what the standard cam was in the early 72 XU-1 before the 72 Bathurst cam became the standard thereafter ?

Hi

It appears to be this one - commonly known as the XH or HX. There seems to be some doubt whether the later one ('72 Bathurst XJ) did become the standard because a couple of late '72 and even '73 Bathurst owners say their cars came with the earlier '72 HX/XH. The part number below is the only XU-1 cam mentioned in the late '73 parts catalogue.

Bazza

[WhiteA9XS]

yes as vin150cars says i also believe the XH camshaft was in the 73 bathurst as i recently pulled one down that had the XH shaft in it ...

and you boys stop the bitching !!!

[WhiteA9XS]

might also add that the engine i recently pulled down was standard bore , pistons
original timing gear , but this engine was also from a 73 bathurst police car .

so in saying this the police cars might of had the standard xu1 camshaft ..

[jb873]

Hi

My listed 73 bathurst came with the standard xu1 cam.

Also seen a JP389 unlisted 8/73 with standard cam, if fact standard whole engine.

Regards

JB

[Bazza]

Hi

My listed 73 bathurst came with the standard xu1 cam.

Also seen a JP389 unlisted 8/73 with standard cam, if fact standard whole engine.

Regards

JB

Hi jb873

Thanks for that info. It is starting to look like only the relevant homologated '72 Bath came out with the "hot" XJ cam and everything thereafter continued to be fitted witht he standard HX/XH cam. That appears to make the Antoniou book wrong.

Are there any other '73 Bath owners that can with "hand on heart" say that their car left the factory with the XJ cam?

Bazza

[Dr Terry]

are u suggesting that the 72 bathurst xu1 was fitted with a 391 cam same as the 73 bathurst listed cars

No, exactly the opposite, the current forum thinking is that the early '72 used the 373/XH/.429 lift camshaft. Then the '72 Bathurst batch were fitted with the 391/XJ/.456 lift cam. It appears that many '73 XU-1 (the magic 150 included) had the smaller XH cam fitted. Maybe GM-H reverted to the XH cam for ALL '73 production.

I would tend to believe this theory because it didn't matter which cam the '73 XU-1s came with from the factory, under the then new Group C rules they could fit any cam they wanted for racing.

Also, Holden had many warranty complaints about rough running & overheating in traffic when the XU-1s were new. It would have made sense for them to fit the smaller cam & therefore less hassles & warranty claims costs.

Dr Terry.