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 DOHC head interchange question
#918624
12/03/08 06:38 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. I've heard that they are the same but not sure if it's been done. There are plenty of DOHC Diamantes at the yards here. I would like to pull a set and get them spiffied up for my SR if they will fit. That way I can keep my SR running untill the heads are ready and then swap them in in a weekend. I'm sure OldColt or VR4 knows <img src="/forums/images/graemlins/cheers.gif" alt="" />
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]
#918625
12/03/08 03:01 PM
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Joined: Sep 2006
Posts: 2,712
Roll Me Over
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Yes the castings are the same. You do need to watch for early and late heads though. Before 93 they did not have the bosses for the cam sensor on the front of the head.
Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.
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Re: DOHC head interchange question
[Re: OldColt]
#918626
12/03/08 03:38 PM
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Joined: Feb 2000
Posts: 3,269
OP
Roll Me Over
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OK, So swapping over cams and cam sprockets and I should be good to go. Thanks
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]
#918627
12/03/08 04:05 PM
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Joined: Apr 2006
Posts: 3,607
Roll Me Over
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I've been thinking about this very idea for a while now since I suspect my valve guide seals are leaky (might be PCV though). What other vehicles got the 3.5L SOHC engine? Sorry for the hijack <img src="/forums/images/graemlins/ignore.gif" alt="" />
'97 Montero 'LSR' - 4.6 gears & factory rear locker, 33" Procomp muds on 15x8 steelies, 50mm coil spacers, T-bar crank, Airlift, sans rear sway, 50mm rear frame & fuel tank lift, Aisins, ARB front bumper + 10k lb winch, 50mm DIY body lift, rock sliders, cut rear quarter panels...
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Re: DOHC head interchange question
[Re: Mad_Scientist]
#918628
12/03/08 05:43 PM
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Joined: Jun 2008
Posts: 785
Rock Warrior
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93+ DOHC 3000gt, stealth, and diamante will all work....though you may want to double check the water crossover bolt locations. if you somehow find a twin turbo the ports flow much better. itll be similar to having ported heads on your truck.
3.5 SOHC was found in diamantes 97+ not sure what else.
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: vr4]
#918629
12/03/08 06:04 PM
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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...
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]
#918630
12/03/08 07:34 PM
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Joined: Jun 2008
Posts: 785
Rock Warrior
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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... IIRC they are the same casting front and rear but with different bosses drilled etc. no matter how you look at it you will need a rear head for the cam sensor mount. ill check my early DOHC heads when i get home to double check that theyre the same front and rear. FWIW its pretty easy to pull the rear head out of a diamante. i havent done it in a yard but it could likely be done in about 90 minutes since you can just cut the belts instead of take everything down to the bare block properly. it took me 2 hours to pull an SR engine out of the yard since i wasnt going to be reinstalling it.
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: justice]
#918631
12/03/08 09:17 PM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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If you pull the heads off of 2 engines, be sure to measure the head thickness so you don't have one that has been milled and another that has not.
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]
#918632
12/03/08 09:29 PM
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Joined: Feb 2000
Posts: 3,269
OP
Roll Me Over
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You read my mind Frank I was just thinking about that. I think it would be wise to just pull from 1 engine.
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]
#918633
12/11/08 02:56 AM
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Joined: Dec 2007
Posts: 261
Mudrunner
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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="" />
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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