Hey Guys,
I'm going to be getting myself an engine soon to work on. Reason is I'll be doing a DOHC conversion on my AWD KL.

So would it be better to just by a Short motor and build up or a Long motor?
And what sort of price if I go Wreckers or Recon?

I have some parts for the conversion and slowly aquiring others.

This will be sort of a hobby as time to work on the motor will revolve around family and work commitments.

Once the conversions done, the old motor is going to get rebuilt and sold.

Once I get the majority of parts I'll prob start a How To or Progress thread for those that might be interested in something similar.

Greg

Buy a long motor, easier.

Keep in mind that the AWD blocks are a touch different IIRC, need to machine it down where the gearbox bolts to the block or something... Was it AndrewD who discovered that?

Long motor for sure.

If you're up for a project, 6G75 conversion?

Yeah I think it's just an unused mount that has to have a bit grinded off or something.

Yeah I read about the grinding around that area, no biggie.

I think with the 75 there is a completly different wiring harness and they don't have a throttle cable as such!

Plus this engine will stay NA

Long motor includes heads? I think - you won't be needing them obviously. Also if there is any machining work you might need to tear it down anyway. Top project though, worth doing.

Helps when my neighbour is also a mechanic:)

Yeah I read about the grinding around that area, no biggie.

I think with the 75 there is a completly different wiring harness and they don't have a throttle cable as such!

Plus this engine will stay NA
75 conversion will also have to comply with EURO3 regulations and all that bull****.

Quad cam ftw

Ok, how about a VR4TT conversion? :)

Ok, how about a VR4TT conversion? :)
As said in first post, want to keep costs down as I have a family to support aswell, and as stated this motor is staying NA

Long motor includes heads? I think - you won't be needing them obviously. Also if there is any machining work you might need to tear it down anyway. Top project though, worth doing.
I could always sell the heads to help fund my conversion.

Wont you need the heads?

Wont you need the heads?
He means the heads from the new motor.

Ok, how about a VR4TT conversion? :)

If you have a spare lazy 10k around + 4-5months of the car off the road then sure.

Short motor mate.
Reason is you wont need anything with the long motor.
And you'll need to grind down the block a bit and possibly get an AWD oil pan (3000GT's use a diff oil pan for FWD and AWD)

probably worth getting those heads rebuilt.
if you were crazy throw some cams in there too but they are about $1200US :O

Yeah I read about the grinding around that area, no biggie.

I think with the 75 there is a completly different wiring harness and they don't have a throttle cable as such!

Plus this engine will stay NA

Your SOHC harness isn't going to exactly run the DOHC motor. Fly by wire is easy to replace sensors are all pretty similar. Go the 75.

Personally i'd be fitting an an aftermarket ECU anyway more tunable and you wont have to go through the trouble of locating a DOHC ecu and swapping harnesses.

Your SOHC harness isn't going to exactly run the DOHC motor. Fly by wire is easy to replace sensors are all pretty similar. Go the 75.

Personally i'd be fitting an an aftermarket ECU anyway more tunable and you wont have to go through the trouble of locating a DOHC ecu and swapping harnesses.

Well its only the heads he's replacing, IMO the 3rd gen manifold should still work. So even his injectors should still plug in, only thing i can think of which wont work right away is the ignition side of things.
75 would be wicked!
only downside i see personally is if he ever wanted to put some serious boost in it i wouldnt trust standard 75 rods (unless from the US 75 they changed them on the AU 75 but on the US75 the rods look about 1/4 thinner then 74 rods by comparison)

Your SOHC harness isn't going to exactly run the DOHC motor. Fly by wire is easy to replace sensors are all pretty similar. Go the 75.

Personally i'd be fitting an an aftermarket ECU anyway more tunable and you wont have to go through the trouble of locating a DOHC ecu and swapping harnesses.
I will be fitting an aftrmarket ECU just undecided as to which one, finding parts will be relativly easy however a lower inlet manifold is hard to come by.

The parts I do have are;

Complete DOHC heads with cam gears,
3000GT Exhaust manifolds (thanks dimi108),
and a 3000GT wiring harness with fuse box again from dimi108(just gotta pay postage when I find out from sydney to townsville)

For now the cams will remain stock but may change to adjustable cam gears.
It will be good if I can find a AWD block but it's not essential.
I'm doing this cause it gives me something to do, i've always wanted to do some sort of conversion and plus I'll learn heaps on how motors work.

I will be fitting an aftrmarket ECU just undecided as to which one, finding parts will be relativly easy however a lower inlet manifold is hard to come by.

The parts I do have are;

Complete DOHC heads with cam gears,
3000GT Exhaust manifolds (thanks dimi108),
and a 3000GT wiring harness with fuse box again from dimi108(just gotta pay postage when I find out from sydney to townsville)

For now the cams will remain stock but may change to adjustable cam gears.
It will be good if I can find a AWD block but it's not essential.
I'm doing this cause it gives me something to do, i've always wanted to do some sort of conversion and plus I'll learn heaps on how motors work.

You wont need the exhaust manifolds, the standard SOHC ones bolt straight up, also wont need the loom either, however you will require the coilpacks off a pajero as well as the timing belt as well. Also a custom made Upper inlet manifold as well so it clears the new heads.

You wont need the exhaust manifolds, the standard SOHC ones bolt straight up, also wont need the loom either, however you will require the coilpacks off a pajero as well as the timing belt as well. Also a custom made Upper inlet manifold as well so it clears the new heads.

mmmmmm OK....Do you know for sure the standard ones will bolt up? Just curious as i thought the manifolds would of been needed aswell?
Upper inlet manifold, standard 3rd gen one I THINK should be fine...then again, never been done...

']mmmmmm OK....Do you know for sure the standard ones will bolt up? Just curious as i thought the manifolds would of been needed aswell?
Upper inlet manifold, standard 3rd gen one I THINK should be fine...then again, never been done...

Well yeah thats it, it has never been done, im just going off what Chris was telling me when he owned the heads.

Well yeah thats it, it has never been done, im just going off what Chris was telling me when he owned the heads.

Ah yep yep. Well either way its gonna be one of the best conversions to come.
a 6g75 block would just spice things up even more!

You wont need the exhaust manifolds, the standard SOHC ones bolt straight up, also wont need the loom either, however you will require the coilpacks off a pajero as well as the timing belt as well. Also a custom made Upper inlet manifold as well so it clears the new heads.
Well the SOHC exhaust outlet is round I'm sure while but the DOHC outlet is oval shaped I know I've checked and so are the exhaust manifolds I have.
As for the upper inlet I'll be scouring the wreckers to find a lower inlet and will check to see it fits.
And yes a 75 block would be nice, 3.8ltr DOHC anyone:D , but finding one in townsville will be hard but there are more 74 blocks around.

I wonder if the 75 block will bolt straight up to my tranny, mmmmm:doubt:

Well the SOHC exhaust outlet is round I'm sure while but the DOHC outlet is oval shaped I know I've checked and so are the exhaust manifolds I have.
As for the upper inlet I'll be scouring the wreckers to find a lower inlet and will check to see it fits.
And yes a 75 block would be nice, 3.8ltr DOHC anyone:D , but finding one in townsville will be hard but there are more 74 blocks around.

I wonder if the 75 block will bolt straight up to my tranny, mmmmm:doubt:

Im a bit under-educated in the feild, but my understanding was that the 75 was a bored out 74, so i GUESS it COULD bolt up. there are those 2 380's at the wreckers you went to with me greg so i might have a look and see if i can find any evidence it will

Would be nice but I'd hate to think what they would want for it.
Plus also got to consider if the heads will bolt up due to coolant flow and actual bolt holes and such.

Would be nice but I'd hate to think what they would want for it.
Plus also got to consider if the heads will bolt up due to coolant flow and actual bolt holes and such.

Time to do some 6G75 google search's

']Time to do some 6G75 google search's
You must have ESPlol

just get some one with the mitsubishi parts finder to pull up the pic of the 74 head gaskets and 75 head gaskets

just get some one with the mitsubishi parts finder to pull up the pic of the 74 head gaskets and 75 head gaskets
This dealership pretty much wont do anything unless you have a VIN or plate number, even then they'd be lucky to tell you what you want to know.

just did a quick google search of head gaskets and they do look different, eh....they've bored these out to almost 4L in the states...4L DOHC!!! now thats where its AT!

Would be nice but I'd hate to think what they would want for it.
Plus also got to consider if the heads will bolt up due to coolant flow and actual bolt holes and such.

There's definetly at least one wrecked 380 in brisbane. The extra capacity would be quite valuable if you could make it happen since you're keeping it NA.

Yeah but here in Townsville they are few and far between and just don't have the cash to have one shipped up.

This dealership pretty much wont do anything unless you have a VIN or plate number, even then they'd be lucky to tell you what you want to know.

Just tell those ****s straight!! When they ask for a VIN just tell them you catch the bus to work and wont finish till after they close. There is one sheila there who is always helpful and the rest of them are hopeless. Ive gotta ring them for prices on stuff too this week, not looking forward to it :rant: dam only having one dealership!

This dealership pretty much wont do anything unless you have a VIN or plate number, even then they'd be lucky to tell you what you want to know.
Carsales is your friend

All this work for not much gain really, a nicely ported pair of SOHC 4valve heads will yield the same if not more horses and be much much cheaper and less fiddly to do (unless ya wanna be unique, then be prepared to shell out the $$$). Sourcing decent performance billet cams for the DOHC heads isnt cheap.

I looked into doing this a few years back when still at MMAL but decided not to cos of cost Vs power gain, there is nothing wrong with the 4valve SOHC heads they can be ported and flowed to give decent hp potential.

Remember its not just the heads that make the power in a NA magna its also the compression, cams and tuning etc

Anyway props to you for taking on the challenge and going the different track to others

Oh and one last thing, ya may as well start this build up with a short motor as you wont need the heads that are on the long motor anyway.

Well I'll be going the Short motor, so the Question now is;
How much roughly am expected to pay for a short motor?
I've already started saving the cash.
As I said this is a long term project and mid next year will be going on a very lucritive overseas trip.

Just to clarify. The heads came off a pajero. SOHC exhaust and lower inlet manifold wont fit. Ports are a different shape, and the inlet bolt spacing is different. All coolant and oil galleries match up to the 6g74 sohc ones. It was only a possibility that 3000gt stuff from the states would fit the heads too.

BTW, to answer your fist post, if you get long blck, i'm sure you could sell the heads on here for some $$$. Put pajero 10:1's in it too!!

Just to clarify. The heads came off a pajero. SOHC exhaust and lower inlet manifold wont fit. Ports are a different shape, and the inlet bolt spacing is different. All coolant and oil galleries match up to the 6g74 sohc ones. It was only a possibility that 3000gt stuff from the states would fit the heads too.

BTW, to answer your fist post, if you get long blck, i'm sure you could sell the heads on here for some $$$. Put pajero 10:1's in it too!!

Interesting, did you have the pajero manifolds to try out?

Just to clarify. The heads came off a pajero. SOHC exhaust and lower inlet manifold wont fit. Ports are a different shape, and the inlet bolt spacing is different. All coolant and oil galleries match up to the 6g74 sohc ones. It was only a possibility that 3000gt stuff from the states would fit the heads too.

BTW, to answer your fist post, if you get long blck, i'm sure you could sell the heads on here for some $$$. Put pajero 10:1's in it too!!
The exhaust manifolds I have match up to the DOHC heads and I'm tracking down either a Pajero or 3000GT lower inlet manifold.
I'm also pretty sure that the fuel rail from the Pajero and GT are the same just different size injectors.