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Discussion Starter #1
I finally started working on my mivec heads. I have an 09 engine. This has the single mivec solenoid where the distributor goes. The cross over tube goes to the back of the front head. I picked up another solenoid that mounts in the front head near the cam sprocket. The oil holes are not drilled. I thought I would just drill these and plug the oil holes on the back side. After looking at it, one of the holes is drilled at a slight angle. This looks like something I could mess up. I was wondering if anyone has drilled these holes? How deep did you drill? These heads are in really good condition and I would like to use them. I was also wondering if these heads can be swapped- put the rear head on the front. My heads are really clean low mile heads.
 

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Ok wait what?

What are you trying to do? Mivec swap?

If so u have the wrong yeat motor.

And no the heads can not be swapped front to back
 

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Discussion Starter #3
I can see that it would be easier to use an earlier engine with the dual soleniods. Is there some other differences in the engines? Everything looks the same to me. The piece that goes on the front head in place of the solenoid looks a lot like a solenoid housing with no fittings. It even uses the same strange gasket. I can see exactly where the oil holes should go. If I wasn't able to successfully drill the holes I was going to replace just the front head.
 

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You need the front SOL...if u remove the rear SOL to place a distributor then u will not have a sol to actvate mivec...just get early model heads...
 

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Discussion Starter #5
I figured out how to fix the front 09 head so the mivec solenoid can function. I just had to drill a couple of holes about 3/4". I have to get a plug for the back of the head where the cross over tube goes. I also have to remember to spin the rocker shaft around and line it up with the new oil hole that I drilled. I did find out that the heads can be swapped-the cam seal and expansion plug just have to be moved.
 

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Just sounds like alot of unneeded stuff when u could just as easily bought a 06-07 motor
 

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Discussion Starter #7
I did some grinding on the exhaust ports of my heads. I wasn't really sure how much material to remove. I was worried I was going to make them all different so I did it in steps. I did a little at a time to each port on both heads. I was able to grind all the seams and get each port smooth. I felt like I was able to remove the same amount on each head. There was a pretty good lip on one side of each exhaust valve and I smoothed that. I was able to polish the ports to a pretty smooth almost chrome finish. I think I'm also going to polish the intake ports also, but I'm not going to remove as much. Chrysler used to have templates to gauge how much material to remove, I wish I had something like that. I've seen some heads really messed up before. I tried to get a good photo of the polish job, but the photo doesn't look as good as it does in person.
 

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Nice nice. So do u have everything for the swap?
 

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Discussion Starter #9
I don't have rod or main bearings yet. I'm not sure what brand I should get. I also haven't picked up any gaskets. I did get the distributor spacer plate.
 

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King or acl work for bearing, i went with ACL

Do u have the rpm window switch
The 6g74 alt and p/s upper brackets
 

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Discussion Starter #11
King bearings was one that I was considering. I will check out the Acl bearings. Thanks for the info. I've got a complete 3.5 with all the brackets. I don't have a window switch yet.

I'd like to find one of those plastic engine covers. Mine was broken when I got the engine. I can never find one at the yards. I've been buffing my spare valve cover and would like to do something interesting with the plastic cover. I think my valve cover is starting to look pretty good. I'm going to grind off a few more places to clean up the look.
 

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I have a CF engine cover...lol

I have a switch if u need one. Its a MSD chip style i was using but not that i will be running it off the AEM i wouldnt need it
 

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Discussion Starter #13

I finished one of the heads. It took a few hours to do the intakes. I decided to give it a polished finish. I have a second set of heads that I may go all out on. I will see how these do first. I think I'm going to do the same thing on my lower 3.8 non mivec intake when I grind the ports to match the mivec intakes.
 

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Discussion Starter #15
I was going to leave them rough, I know it's supposed to keep fuel suspended better.l, but It's such a short run to the valves. I want the ports to match the intake manifolds. They are just flowing air so I'm polishing them as far up as I can. I've seen other heads with polished intakes that do just fine.
 

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I was going to leave them rough, I know it's supposed to keep fuel suspended better.l, but It's such a short run to the valves. I want the ports to match the intake manifolds. They are just flowing air so I'm polishing them as far up as I can. I've seen other heads with polished intakes that do just fine.

Yea . There isn't a lot of good data to judge by , lots of old school info but no back to back tests. Then there are cnc ports and they out flow everything but who knows if surface finish does it or port shape does it . Too many variables.


Sent from AutoGuide.com Free App
 

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Discussion Starter #17


I was able to find a plastic cover at a Mitsubishi dealership for $35. I'd like to do something interesting with it, but the black does look good with the polished valve cover. I've seen some interesting paint jobs on the plastic cover. I have a polished upper intake that is the Chrysler version of the 6G73. This is the only intake that will fit my car. It's not good enough for the mivec engine. I am working on modifying some other intakes. I have about every type made.
 

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Discussion Starter #18

This is where you drill the holes so you can use the newer heads. The horizontal hole is about 1-7/6" deep straight in. The vertical hole is only maybe 3/8" deep. I used the other head as a guide to determine location and depth. This let's oil into the rocker shaft. You will still need the solenoid from the 06-07.
 
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