3.0 V6 SOHC head info

I have a 89 3.0 V6 SOHC Raider it smokes like a train with 230K .. Have a line on heads from a 94 Dodge Stealth 3.0 V6 SOHC ..Are they the same and at what point did Mitsu improve the valve guides ...? ..Thanks

Should be the same 12 valve head in the 94 Stealth.

The only problem I can see is if the accessory bosses are in a different place. Even then, that is just re-drilling and tapping.

Thanks for the info guys ... The 'rumor' is they are the same ... It is 'said' the cams are not the same ... The Stealth only has 104k and at some point 'I read' that Mitzu fixed the made of cheese valve guides are updated ...I am going to pull the heads and see what they look like ... I will be running the Stealth cams just to see how they run...

Based on my limited (very) understanding of both the issues you raise in the above post, the Stealth cams should move the powerband up the rev scale, which might work out well for your style of driving. Since you don't do a whole lot of slower off-road driving, you might like them even better than the Montero grind.

The original valve stem seals, which is what I'm guessing you are talking about, as opposed to the valve guides themselves, were a different part number for intake and exhaust. At "some point" they figured out that the intake stem seals were not good and now all the valves use what used to be just for the exhaust.

Unless you are actually talking about the valve guides themselves. I seem to recall there being a change to those as well, where the valve guides may have had an issue dropping. Not sure of the change or how/what was done about those. Again, my knowledge on that particular is pretty basic.

John B.

The cams we really have no data on how they would 'acted' in a Montero ...The Stealth is a pig like a Monty so did they up the rpm range that much or not ..So we well see what it comes out to ...I do know that everything with the Mitsu/V6 runs better then a Monteros .. Sorry to say ..

If I remember the Non-Montero 3.0's had cams that were ground for High RPM's and the Montero's were done for Low RPM's. I had a 3.0 Caravan, and it seemed to be a little more peepy on the high end, but I got it for free and ran the pee out of it whenever I could so... yeah. <img src="/forums/images/graemlins/smile.gif" alt="" />

I actually got some info from the two senior techs at the dealership on this a few years ago.

The cams are not the same grind between the cars and the Monteros/Montero Sports. Apparently, they never were. The recommendation was not to use the car cams in any SUV. Besides the (possibly negligible in your case) weight difference, there's gearing differences as well as aerodynamics differences. Truck/SUV cams are typically ground to produce (more) torque lower in the RPM range and a flatter torque/HP curve to compensate for the above.

Anyway, they didn't recommend it. I tend not to, either. I've never seen anyone successfully run car cams in a truck or SUV even when the engine was going into a lighter vehicle. Aerodynamics, tire size, gearing all make a huge difference and even moving the torque/hp a few hundred RPM can mean the difference between a snappy ride and a pig. Just my 2 cents for what it's worth.

Edward

I remember a while back guys were running Diamante heads in Montero's for better power BUT that's a little different because I think those cars are an interference 12v Motor so they may have longer valves or something else going on. Then again I know nothing about mixing and matching V6's. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Haztoys cares nothing about any of the above. No one drives what he drives where he drives it except him. You should visit him sometime.

Of course, no one who drives on the street or on a 4WD trail with low-rpm technical duties should try why he's suggesting. He just doesn't drive that way.

John B.

my 2 cents on original question.
In 1992 heads started coming from factory with the snap rings on the exhaust guides. '91 and previous had a TSB that describes cutting tool and snap ring installation. If heads have ever been redone, they will most likely have the snap rings on the aftermarket exhaust guides.
The Steath/Diamante had different cams. Some cams have marks on them,, but the marks change location with each production run on these so I wouldn't trust ANY markings.

Atta boy, Krz. Good, solid info. I'd forgotten that stuff.

John B.

Ding Ding .. We have a winner .. Info not rumors ...

Part numbers are coming up real crazy to all the 'Dont do it crowd..' As if one was to order a '89' SWB Raider cam one would not get the same cam as a '90 LWB to all Montys to Steath and so on to '02' cam ...So is a 89 SWB cam is not the same as 90 LWB on up cam ..?????...Numbers say..?

Then theres the Sigma and in JDM none USDM cars cam... <img src="/forums/images/graemlins/zombie.gif" alt="" /> <img src="/forums/images/graemlins/zombie.gif" alt="" />...

So not sure what to think ..? You tell me..?

Please do home work before posting ...

I think taking the insides of a later car and installing into a 'V6 SWB' block is an upgrade.. Do to pistons and cams ...(The Sigma is where the power is .I think... <img src="/forums/images/graemlins/confused.gif" alt="" /> ) .. To bad FrankR is not around he has info on SOHC V6 12v HP ..

No one has 'hard' info on making SOHC V6 12v HP ..I have some from a 'time far far away '

I get strange info and have some old school info too ... Will see where I end up ...

(Disclamer is SWB we are dealing with... not LWB ...)

Good to be home ... I think the places I seem to end up everyones crazy ...

Got the heads off and home ...They look real good ...Car was days from the crusher ...Will see what I end up with on these ...

There was a 6G72 engine manual on mitsubishilinks.com at one time that had a breakdown of the cam codes. I dont think the site is up right now though.

Thanks ..I'll take a look ... Did a little work on numbers and cam and part numbers ... I'm finding a mess of differant cams ... Dont understand where the 'all cams are the same' came from ...? .. <img src="/forums/images/graemlins/confused.gif" alt="" />