I was readin through an old ZOOM mag the other day, which had a list of dozens of import engines. The one that stuck most in my mind was the 6G74 DOHC from the Debonair, rated at 194kw & 323nm.
Any ways, I was wondering if it would be possible to do a head swap to the SOHC 6G74 block? Has anyone seen or heard of this done? Cause the extra 30kw odd over the VRX would be REAL handy, espeacially once u start to mod THAT!

i looked at that option a while back, but to cut the story short this was the outcome;

-hard to source DOHC head
-unknown bolt pattern for the DOHC (it wont nessarly be the same as the SOHC)

they were the main ones to think of..

i spose it could be done, and only time and money will prove this lol

I'd assume no, on the fact that the 3.0 sohc 12v and dohc 24v bolt patterns are different.

But I'd like it if you could prove me wrong!! :D

I'd assume no, on the fact that the 3.0 sohc 12v and dohc 24v bolt patterns are different.

But I'd like it if you could prove me wrong!! :D

Yeah, but he's talking about the DOHC 3.5 and his SOHC 3.5.

Yes I know...I was citing the differences between the sohc 3.0 and the dohc 3.0 as the basis of my answer. ;)

IF the SOHC and DOHC share the same block...on the theory that the blocks would be mass produced from the same design, would'nt the bolt pattern have to be the same????

IF the SOHC and DOHC share the same block...on the theory that the blocks would be mass produced from the same design, would'nt the bolt pattern have to be the same????

That would be logical but it can't be assumed.

I think Killbilly was answering that question by saying that with the older 3.0l they WERE different so they will probably still be different with the 3.5's

Yes Mark the blocks are mass produced but the 6G 3.0L and 3.5L in our magna's are made here in Aus whereas the DOHC versions of our motors are made elsewhere. I don't think MMAL have ever made a DOHC V6 Motor. Correct me if im wrong.

Correct me if im wrong.

Nope, you're right. I queried MMAL on this once. Any overseas markets with DOHC didn't come from here. We don't have the tooling for it.

Yes Mark the blocks are mass produced but the 6G 3.0L and 3.5L in our magna's are made here in Aus whereas the DOHC versions of our motors are made elsewhere. I don't think MMAL have ever made a DOHC V6 Motor. Correct me if im wrong.
Going from what I know and what I see here, there is obviously no clarity as to wether an overseas block is the same as an australian block. Given the similarities between models, hedging my bets, I reckon the bolt patterns would be the same. Afterall, even if they are made overseas or in Australia, 6G72 and 6G74 blocks would have to be the same design, otherwise, they would have different model numbers???

Given the consideration of different "tooling". what does this really mean, does it mean we cant produce the heads here or does it mean a complete different engine setup? I'm guessing its just the heads and the tooling required to make DOHC would be rather minimal. Therefore, unless proven wrong, I would assume the blocks would match, wether made OS or in Australia.

Let us not forget the DOHC heads are obviously and remarkably more complex and have more parts per head then their SOHC couterpart, therefore it would be safe to assume that there is the slightest of possibilities that the DOHC heads necessitate a differnt bolt pattern :D

PS dunno about other guys but reading through this thread, I noticed most people where using sofisticated language, reminded me Fraisher(sp?) so I had so spice up my post lol

what about a DOHC For the 2.4 altera ENgine? IM sure its the same engine in the states (eclipse) exept i think its backdefrount.. ill post some pics :S

2.4L dohc
"" the Spyder GS with a new normally aspirated 2.4 ""
http://us.f1.yahoofs.com/groups/g_2135336//Yahoo!+Photo+Album/aan.jpg?grdRBoABR9y7pluQ
^^^^eclips motor 2.4L 4g64
http://us1.webpublications.com.au/static/images/articles/i18/1855_5mg.jpg
OUTLANDER^^^2.4L 4g64*(100kW at 5000 rpm )

I cant find any pics of the 2.4 4g64 MAGNA AUSTRALIA vertion but it looks like its around the other way in the eclips or is that just the cammera??

Even if the bolt pattern was the same, which it could be but I do think its unlikely you still have to worry about cooling / water passages and oil passages etc.

If someone wants to attempt it go right a ahead, I would be curious of the result :D

Going from what I know and what I see here, there is obviously no clarity as to wether an overseas block is the same as an australian block. Given the similarities between models, hedging my bets, I reckon the bolt patterns would be the same. Afterall, even if they are made overseas or in Australia, 6G72 and 6G74 blocks would have to be the same design, otherwise, they would have different model numbers???

Possibly. In the case of our 3l engines we have here they are 6G72 for the 2nd gen cars and 6G72-S4 for the 3rd gen cars.

i think chances are that the 3.5 24V SOHC and 3.5 24V DOHC heads would match up,
why not write to street machine or mitsubishi and find out for sure if someone is really interested in doing it. :doubt: and let us all know..

i think chances are that the 3.5 24V SOHC and 3.5 24V DOHC heads would match up,
why not write to street machine or mitsubishi and find out for sure if someone is really interested in doing it. :doubt: and let us all know..

They're not. I asked several sources just on a whole Mivec engine swap and no one had a clue. Dean from Motor Mag was the best source of info and felt it should be simple with the use of an aftermarket ECU. Mitsu had no idea, not that you could expect they would.

yes...considering the bumsteer KB got about that one :roll: lol

Correct me if i'm wrong, but didn't the Pajero's come out with the DOHC 6G74 motor?

I know the engines are in a different orientation, but surely the blocks would be the same, or very similar. :eh:

Correct me if i'm wrong, but didn't the Pajero's come out with the DOHC 6G74 motor?

I know the engines are in a different orientation, but surely the blocks would be the same, or very similar. :eh:

Yeah, so maybe that might make some heads available. Won't be Mivec but DOHC means that the timing of the intake and exhaust is independant of each other so tuning should be better.

Here is My 4g64... For Pinesapple.

off topic slighty.... for u 4g64 guys..... apparently the 4g63 turbo heads/manifold/etc are a bolt on.

http://www.carotica.com/4g64/

Yeah the 4G63 head is a bolt on, nearly did it in my 2.4 TE but then came to my senses...

I don't think a couple of waterjackers match up though.

Check out the motor at the bottom of the page 6G74 DOHC twin turbo (looks factory to me) http://robskorner.freehomepage.com/faqs/othermotors/othermotors.html and http://www.autospeed.com/cms/A_0307/article.html?popularArticle

Check out the motor at the bottom of the page 6G74 DOHC twin turbo (looks factory to me) http://robskorner.freehomepage.com/faqs/othermotors/othermotors.html and http://www.autospeed.com/cms/A_0307/article.html?popularArticle
that autospeed article is a complete stuff up... its like its all bull**** with minimal research.... like the fact that they have a 6G74 quoted at the same power as a 6G74 turbo!! i know MIVEC is good.. but its not T good!! i spose some credit should be given to them for trying, but for me it discredits them some what!!

that autospeed article is a complete stuff up... its like its all bull**** with minimal research.... like the fact that they have a 6G74 quoted at the same power as a 6G74 turbo!! i know MIVEC is good.. but its not T good!! i spose some credit should be given to them for trying, but for me it discredits them some what!!

Yes that artical is dodgy. Two things to remember too: Japanese underquote many power outputs and the 3.5 Mivec engine uses a 32mm restrictor plate. With that removed, it would pull more power again.