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Head modification 

 

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 Post subject: Head modification
Posted: Sat Oct 15, 2005 5:33 pm 
Oompa Loompa
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I am replacing my head gasket (3.9L cpi EA), and while the head is off i am going to mill the head (shave it ) and also put in a mild street race cam. My question is how many thow should i plain off the head? Any help with this would be great

 

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Last edited by dynomite!!!! on Sat Oct 15, 2005 5:35 pm, edited 1 time in total.

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Posted: Sat Oct 15, 2005 5:35 pm 
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It al depends on the compression your chasing, and what fuel you'll be running, with what advance, and if you are ever gonna boost the engine.

If you are just doing the headgasket, just make sure its flat, and leave it. If you want some perfomance, go for 40thou (quite a bit though). Just remember, you can always go more, but you can't go back (without decomp plates and all that s**t).


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Posted: Sat Oct 15, 2005 5:42 pm 
Oompa Loompa
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Not going to bother to boost it . Just looking for a bit more compresion, if i did plain down 40 thou how much would a adjustible cam gear cost? and would i have to make any more mods other than extractors?

 

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Posted: Sat Oct 15, 2005 5:44 pm 
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um.. you can always have more mods lol. Use an AU headgasket (they are stronger), and new headbolts, shave it down, might aswell do valve stem seals, you can always port and polish it while its out, and the adj cam gear should be about $100 I think. Don't forget the shims if the cam is a regrind. Also, might wanna get it dialed in.


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Posted: Sat Oct 15, 2005 5:45 pm 
Getting Side Ways
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dynomite!!!! wrote:
Not going to bother to boost it . Just looking for a bit more compresion, if i did plain down 40 thou how much would a adjustible cam gear cost? and would i have to make any more mods other than extractors?



cam gear are between $140 and $200 if you take that much off you will need one.

one other thing you will get some timming chain noise

 

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Posted: Sat Oct 15, 2005 5:46 pm 
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dunno... my mate had 60 thou taken off, and all was well... Stock XR6 cam, no adj cam gear either.


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Posted: Sat Oct 15, 2005 5:49 pm 
Oompa Loompa
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Thanks for the tips and nice burn out

 

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Posted: Sat Oct 15, 2005 5:53 pm 
Oompa Loompa
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A question about using the AU head gasket insted of the EA, are the blocks the same mold or just very similar

 

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Posted: Sat Oct 15, 2005 6:20 pm 
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the blocks between the AU blocks and E series blocks are substantial.. but on top they are the same ( AU head goes on E series block ).
The guy I was talking about has an AU head on his EL bottom end, all fit nice.

AU ones are metalic, and much stronger... (twin metalic layers I think)...

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Posted: Sat Oct 15, 2005 6:23 pm 
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And thanks about the burnout btw.. lol.


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Posted: Sat Oct 15, 2005 7:12 pm 
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be careful putting an au head on a ea-ef. you will also need au rocker gear or you will end up with lots of lifter noise that you can't get rid of. been there done it!!!

 

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Posted: Sat Oct 15, 2005 7:50 pm 
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Good point... forgot about that.


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Posted: Sat Oct 15, 2005 8:23 pm 
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justfordima wrote:
dunno... my mate had 60 thou taken off, and all was well... Stock XR6 cam, no adj cam gear either.

Cheers


Did the timing chain rattle much?

 

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Posted: Sat Oct 15, 2005 8:26 pm 
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no, not that I heard. It was mostly the lifters making noises, but nothing serious. This was all AU gear.. like the whole head was an AU, with an AU XR6 cam. And it was worked. (By Jaysen and ITS Performance [mark]).
The cam/cam gear was meant to be next...

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Posted: Sat Oct 15, 2005 8:59 pm 
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justfordima wrote:
dunno... my mate had 60 thou taken off, and all was well... Stock XR6 cam, no adj cam gear either.


Cheers


you'll find the cam timming is out by a few degrees

 

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