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Au head onto an ef block 

 

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 Post subject: Au head onto an ef block
Posted: Sun Feb 08, 2015 3:40 pm 
Oompa Loompa
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Age: 20

Posts: 20

Joined: 30th Dec 2012

Ride: Mini spooled ef falcon

Location: Nowra
NSW, Australia

Okay so I got a few questions!
I want to put an au head onto my ef xr6 block.
Is there any advantage, I have heard the au heads have bigger valves, is this true?
Is it just a straight swap over?
I have an ef stage 3 cam I want to put in it to, will the cam work in the au head, I think I have to put ef rockers in it to, is this correct?
Cheers!
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 Post subject: Re: Au head onto an ef block
Posted: Sun Feb 08, 2015 4:23 pm 
Technical Contributor
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Age: 60

Posts: 6817

Joined: 22nd Jun 2005

Gallery: 8 images

Ride: EF Fairmont

Location: Campbelltown
NSW, Australia

Okay so I got a few questions!
I want to put an au head onto my ef xr6 block.
(A) Why would you?
Is there any advantage, I have heard the au heads have bigger valves, is this true?
(A) AU Valves are the same dia as the XR Valves, Stems are smaller Dia. I see no adavantage of the AU Head over the EF Head.
Is it just a straight swap over?
(A) Yes it is if you want. AU Cam must be used with the AU Rockers and head.
I have an ef stage 3 cam I want to put in it to, will the cam work in the au head, I think I have to put ef rockers in it to, is this correct?
(A) Many answers on this one. Heard of it being done and working, also heard of it not working. I haven't done it and I wouldn't bother. I believe that the Valve stem lengths are different as are the Valve Springs.

Last edited by SWC on Thu Feb 19, 2015 5:46 pm, edited 1 time in total.

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 Post subject: Re: Au head onto an ef block
Posted: Sun Feb 08, 2015 4:54 pm 
Oompa Loompa
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Age: 20

Posts: 20

Joined: 30th Dec 2012

Ride: Mini spooled ef falcon

Location: Nowra
NSW, Australia

Thanks man, Starting to get a head gasket leak, so I thought I'll go au head if it has bigger valves, but no point clearly! So I'm better of just doing a head gasket and running the au head gasket, and putting the cam in my xr head then?
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 Post subject: Re: Au head onto an ef block
Posted: Thu Feb 19, 2015 4:16 pm 
Oompa Loompa
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Age: 32

Posts: 21

Joined: 27th Feb 2012

Ride: 5.0L eb fairmont ghia, xe ute

Location: gold coast
QLD, Australia

Just make sure you get your head checked for cracks and corrosion and if its cracked your better off getting another head and in my opinion the au heads are the only ones worth using because they dont seem to have the cracking or corrosion issues of the earlier heads.
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