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 Re: DOHC head interchange question
[Re: justice]
#918634
12/11/08 03:03 AM
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Joined: Jan 2008
Posts: 985
Rock Warrior
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I want to confirm weather or not the 3.0 DOHC and 3.5 DOHC heads are interchangeable. Ok....... lil bit of a threadjack but...... hopeufly Justice will forgive me So what about the SOHC 3.0 like whats in my Mighty Max???? I guess I misread this when I saw it the first time or is there any head upgrade for that motor?
--keRby
Ad Inexplorta
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Re: DOHC head interchange question
[Re: IncorpoRatedX]
#918635
12/11/08 03:46 AM
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Joined: Feb 2000
Posts: 3,269
OP
Roll Me Over
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The water crossover pipe is what concerns me a little. But The Diamante DOHCs are plentifull in the yards here and easier to find than a DOHC Montero. Also are the left and right banks interchangable on the DOHC engines? Since I'm lazy, It would be easier to pull two different front heads off two seperate cars maybe not the best idea, but a thought... Not at all, you'd have the ports backwards... pull two 'front' heats and you'll have two passenger side heads which would put the exhaust ports on the inside on the driverside... <img src="/forums/images/graemlins/scared.gif" alt="" /> Not if you can turn the head 180 and flip the cams over like you can on the 12V 3.0, which is why I asked the question. But with the water crossover pipe this is probably not the case with the 24V DOHC heads.
99 Gen 2.5, fixing blown head gasket
89 SWB- 33's, ARB Front locker, SR rear locker/axle, SR F brakes, winch, WST Offroad Armor all Around, 2.85 Aussie T-case Gears (SOLD)
Sold: (2) 95 SR's, 86 SWB, 90LWB, 91 LWB
-Can Change a timing belt in my sleep..
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Re: DOHC head interchange question
[Re: 1986powerram50]
#918636
12/11/08 03:52 AM
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Joined: Feb 2000
Posts: 3,269
OP
Roll Me Over
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I want to confirm weather or not the 3.0 DOHC and 3.5 DOHC heads are interchangeable. Ok....... lil bit of a threadjack but...... hopeufly Justice will forgive me So what about the SOHC 3.0 like whats in my Mighty Max???? I guess I misread this when I saw it the first time or is there any head upgrade for that motor? All variants of the mitsu 6G72 12V 3.0 heads are all pretty much the same but there are some variants in the cams, cam sprockets, and valve cover bolt boss. But there is no bolt on upgraded 12V head that I'm aware of.
99 Gen 2.5, fixing blown head gasket
89 SWB- 33's, ARB Front locker, SR rear locker/axle, SR F brakes, winch, WST Offroad Armor all Around, 2.85 Aussie T-case Gears (SOLD)
Sold: (2) 95 SR's, 86 SWB, 90LWB, 91 LWB
-Can Change a timing belt in my sleep..
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Re: DOHC head interchange question
[Re: justice]
#918637
12/11/08 05:00 AM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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All variants of the mitsu 6G72 12V 3.0 heads are all pretty much the same but there are some variants in the cams, cam sprockets, and valve cover bolt boss. But there is no bolt on upgraded 12V head that I'm aware of. Correct - and AFAIK, there's no "bolt-on" anything for the 3.0L 12v SOHC engine that will make more power. There are a couple of header sets manufactured, but I doubt much gain would be realized from them - maybe a little. If you want to spend a day with a die grinder, the heads can be ported and gasket matched to the manifolds which might help a little. I've done that to mine, but I don't know if it does much more than makes me feel like I did something to "make it better". Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: DOHC head interchange question
[Re: FrankR]
#918638
12/11/08 08:29 AM
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Joined: Dec 2007
Posts: 261
Mudrunner
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I'm going to check tomorrow on a set of 3kGT twin turbo heads, if swapped how you've explained, the heads externally look like they'll work, but im going to have to check out the cam situation.
I'll post info as i find out, unless you've actually done this or have a set of DOHC heads.
V45W - 1999, 3.5 sohc, winter package
L042G- 1987, 2.6 carb, auto - Cylon Raider
A112 - 1973 Galant Wagon - 4G63 Turbo, 5 speed
L023G - 1983, 2.6 carb, 5 speed manual 4WD
L028 - 1983, 4D55 turbo diesel 2WD
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Re: DOHC head interchange question
[Re: IncorpoRatedX]
#918639
12/11/08 12:11 PM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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I've placed a set of DOHC heads side-by-side and compared them to SOHC heads..... same with DOHC/SOHC blocks. You'll find that the DOHC heads will bolt on, but there is a small cooling water passage between the exhaust valves on the DOHC heads that is fed from the DOHC block. The SOHC block does not provide the supply for that passage.
Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: DOHC head interchange question
[Re: 1986powerram50]
#918640
12/14/08 09:23 PM
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Joined: Mar 2004
Posts: 584
Rock Warrior
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So what about the SOHC 3.0 like whats in my Mighty Max???? The sohc heads are entirely reversible, in my experience with 4 or 5 motors... the CAS/dizzy mount's bolt- on, and all the bosses have been drilled. Even on various Chrysler products t
'89 V6 4dr- '4- Doris'
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Re: DOHC head interchange question
[Re: IncorpoRatedX]
#918641
12/18/08 06:36 PM
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Joined: Mar 2008
Posts: 78
Getting the Wheeling Fever
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I'm going to check tomorrow on a set of 3kGT twin turbo heads, if swapped how you've explained, the heads externally look like they'll work, but im going to have to check out the cam situation.
I'll post info as i find out, unless you've actually done this or have a set of DOHC heads. 93+ 3000GT/Stealth heads are interchangeable with SR heads. They are identical and can be swapped from side to side (just spin them 180 degrees and swap locations for the coolant block off plate). The castings are the same and so are all of the mounting holes.
96 Montero SR
94 Dodge Stealth TT
92 Mitsu Galant VR4
91 Mitsu 3000GT
95 Mitsu 3000GT, carbon black, for sale
95 Mitsu 3000GT, white, for sale
92 Mitsu 3000GT VR4, silver, for sale
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Re: DOHC head interchange question
[Re: Hans_GZP]
#918642
12/18/08 06:56 PM
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Joined: Jun 2008
Posts: 785
Rock Warrior
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I'm going to check tomorrow on a set of 3kGT twin turbo heads, if swapped how you've explained, the heads externally look like they'll work, but im going to have to check out the cam situation.
I'll post info as i find out, unless you've actually done this or have a set of DOHC heads. 93+ 3000GT/Stealth heads are interchangeable with SR heads. They are identical and can be swapped from side to side (just spin them 180 degrees and swap locations for the coolant block off plate). The castings are the same and so are all of the mounting holes. who let you in hans? <img src="/forums/images/graemlins/smile.gif" alt="" />
87 Montero V6 SWB auto. dual bouncies 89 Montero V6 SWB 5 speed. dual bouncies 97 3000gt VR4 upgraded turbos, 10:1, E85 91 Stealth TT twin 18Gs, cams/heads, E85 03 cobra lightly modded <img src="/forums/images/graemlins/lol.gif" alt="" /> 91 MR2 turbo
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Re: DOHC head interchange question
[Re: Hans_GZP]
#918643
12/18/08 07:07 PM
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Joined: Feb 2000
Posts: 3,269
OP
Roll Me Over
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I'm going to check tomorrow on a set of 3kGT twin turbo heads, if swapped how you've explained, the heads externally look like they'll work, but im going to have to check out the cam situation.
I'll post info as i find out, unless you've actually done this or have a set of DOHC heads. 93+ 3000GT/Stealth heads are interchangeable with SR heads. They are identical and can be swapped from side to side (just spin them 180 degrees and swap locations for the coolant block off plate). The castings are the same and so are all of the mounting holes. Thanks for the info. Thats what I was curious about.
99 Gen 2.5, fixing blown head gasket
89 SWB- 33's, ARB Front locker, SR rear locker/axle, SR F brakes, winch, WST Offroad Armor all Around, 2.85 Aussie T-case Gears (SOLD)
Sold: (2) 95 SR's, 86 SWB, 90LWB, 91 LWB
-Can Change a timing belt in my sleep..
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