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3.0 V6 SOHC head info #1076034 01/04/15 11:30 PM
Joined: Aug 2009
Posts: 989
haztoys Offline OP
Rock Warrior
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

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Re: 3.0 V6 SOHC head info [Re: haztoys] #1076035 01/05/15 12:25 AM
Joined: Aug 2014
Posts: 173
danz91crx Offline
Should be the same 12 valve head in the 94 Stealth.

1990 LWB RS A/T
1990 LWB Base A/T
1991 LWB LS A/T Going...Going...
Re: 3.0 V6 SOHC head info [Re: danz91crx] #1076036 01/05/15 04:54 AM
Joined: Dec 2007
Posts: 2,311
Mudraider Offline
Body Damage is Cool
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.

Re: 3.0 V6 SOHC head info [Re: Mudraider] #1076037 01/05/15 01:17 PM
Joined: Aug 2009
Posts: 989
haztoys Offline OP
Rock Warrior
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...

Last edited by haztoys; 01/05/15 01:22 PM.
Re: 3.0 V6 SOHC head info [Re: haztoys] #1076038 01/05/15 05:18 PM
Joined: Jun 2002
Posts: 6,208
JohnnyBfromPeoria Offline
Trail Leader
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.

'87 Raider 2.6 Turbo Auto, Under Construction
'95 Montero SR, 35x12.5/15 BFG M/T KM-2's, Rock sliders, Qtr panel chop, gas tank lift, 2" BL, Aisins, 5.29s
'95 Pajero Mini
'98 Montero Winter Ed.
'04 Cadillac XLR
'03 Kawasaki ZRX1200R
'60 Ford Falcon 4Dr
Re: 3.0 V6 SOHC head info [Re: JohnnyBfromPeoria] #1076039 01/06/15 02:37 AM
Joined: Aug 2009
Posts: 989
haztoys Offline OP
Rock Warrior
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 ..

Re: 3.0 V6 SOHC head info [Re: haztoys] #1076040 01/06/15 08:26 PM
Joined: Mar 2006
Posts: 422
heathdogg Offline
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="" />

Blacktero: 90 Montero Lwb V6 RS Model. 16" Toyota Alloy Rims, Dual Bouncy's; Gen II Front Rotors & Calipers; Rear LSD

Sraider: 87 Raider 2.6 base. Work yet to be done.
Re: 3.0 V6 SOHC head info [Re: haztoys] #1076041 01/06/15 08:38 PM
Joined: Jul 2003
Posts: 850
ES_97Sport Offline
Rock Warrior
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. smile


'97 Montero Sport LS 5-Speed 3.5L conversion
SAS Dana 44s & ARBs, 35" Yoko Geolandar M/Ts
NP231 B4R doubler/Terra Low231/RP 5.38 229:1
'99 Montero Sport Limited 4WD SAS 3-link project
'03 Montero Sport Limited AWD
'97 Montero Sport LS 5-Speed 4WD
Re: 3.0 V6 SOHC head info [Re: ES_97Sport] #1076042 01/07/15 02:36 AM
Joined: Jan 2002
Posts: 6,133
TOASTY Offline
Trail Leader
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="" />

1999 Montero SAS'd on Kings and stuff

1998 Montero trying to get a V8 Swapped
Re: 3.0 V6 SOHC head info [Re: TOASTY] #1076043 01/07/15 03:47 AM
Joined: Jun 2002
Posts: 6,208
JohnnyBfromPeoria Offline
Trail Leader
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.

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