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au head to ea motor 

 

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 Post subject: au head to ea motor
Posted: Wed Jun 13, 2007 9:14 pm 
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i have scored a mint au 4 litre head which i am porting and polishing,reseating the standard valves and using the standard springs and retainers,i am going to be using an ef xr6 cam,hopefully i will get some gains but i was just wondering if anyoneknows if it is a straight bolt on thing,im thinkin of gettin the head shaved 10 or 20 thou aswell and will be using an au head gasket,any help appreciated

 

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Posted: Wed Jun 13, 2007 9:29 pm 
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Yeah should go straight on, ur going to use the XR6 rockers with that cam arnt ya?

 

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Posted: Wed Jun 13, 2007 9:33 pm 
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dont actually have the rocker gear at all,only the head and valves,still waitin for the cam,are the rockers different for xrs,i thought that the xr series only had slightly stiffer springs?im usin standar au springs,will it valve bounce easier with standar rockers?

 

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Posted: Wed Jun 13, 2007 9:34 pm 
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If ur gonna use the EF cam u will need the EF rockers also as AU rockers are different ratio. springs shouldnt bounce XR cam is nothing major. But im not sure if EF springs and AU springs are the same.

 

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Mods going on: Nizpro springs, bosch 040 pump + Walbro gss341, 600cc injectors, PWR transcooler, 20% Underdrives, 15psi Actuator, Kingspring SSL's, 15psi tune.....More coming

Last edited by Molloy on Wed Jun 13, 2007 9:38 pm, edited 1 time in total.

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Posted: Wed Jun 13, 2007 9:36 pm 
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Did the XR's have double valve springs?

 

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Posted: Wed Jun 13, 2007 9:39 pm 
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cool bananas,ill hunt down the e series rockers for it,they bolt on same hey?i know ea 3.9s had double springs,the au ones seem very soft,hope it dont matter with the xr cam

 

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Posted: Wed Jun 13, 2007 9:41 pm 
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Yeah they bolt in the same, You might wanna ask around about the springs, should just get some Crane springs and whack in save u doing it later if you get a bigger cam.

 

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Mods going on: Nizpro springs, bosch 040 pump + Walbro gss341, 600cc injectors, PWR transcooler, 20% Underdrives, 15psi Actuator, Kingspring SSL's, 15psi tune.....More coming

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Posted: Wed Jun 13, 2007 9:47 pm 
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i got the head for free which had one slightly bent valve so im replacing that and i got the cam for free so i gotta spend some cash on rockers and a valve,dont really wanna spend too much money on it,im an apprentice mechanic and this is my first time actually porting and modifying a head

 

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Posted: Wed Jun 13, 2007 9:48 pm 
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Too easy mate, get stuck in good fun 2 be had.

 

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Mods going on: Nizpro springs, bosch 040 pump + Walbro gss341, 600cc injectors, PWR transcooler, 20% Underdrives, 15psi Actuator, Kingspring SSL's, 15psi tune.....More coming

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