Found a 3.8l 6G75 Block (4.0l + potential) specifically to fit the 3000GT / Stealth chassis
Found in these.. V77W Pajero
and you'll need one these.. JDM 6G74 DOHC (use everything off this but the block)
P.S- For the ppl who dont know the 6g74/75 block have the same deck height so you'll need most of the gear of this engine to make up added deck height, the 72 dohc gear doesn't fit - check Wrench Monkeys page to get a better understanding of what i mean --- http://wrenchmonkey.com/Webpages/6G74swap.html
What I'm doing now is sourcing an oil pump + water pump, they should bolt straight up from a 6g72, then I need to source the brackets listed below and see what's missing on the block/needing adjusting.
Mounting Brackets
-72/74 AC Bracket
-74/74 Upper PS Bracket
-72 Lower PS Bracket/Tensioner
-72 Motor Mount Bracket
-74 Alt Bracket
-72 Rear Motor mount Bracket
-72 Right engine side bracket
-72 Left engine bracket
-72 left and right Gearbox Stays.
if I can remember I'll take more photo's of the Eclipse and Pajero Cranks I have, and weight the blocks and cranks to see what the differences are, might also compare the Eclipse block to this one since the eclipse appears to have more bracing.
the block I have seems to have been reconditioned, judging by the half arsed black painting and weird non mitsu gaskets (very very thin rubbish) so I might get the caliper out and see if the bore is still 95mm.
Have you tried what BDranck suggested? I know he used the 74 oil pump housing but had it machined so the billet 72 gears fit since they're a little more stout. I would definitely be interested in more info on welding the bosses when available. Are the block and crank weights between the 72 and 75 or are you going to weigh all three?
I don't have a 72 to weigh, so maybe someone else can do that one? I will weigh the 74 and 75 blocks and cranks tonight
thankfully I don't need to go through the stuffing around with converting the oil pump like bdrank did either, a 72 oil and water pump will bolt straight up, as will the oil filter hanger.
wow. thats going to be crazy! what is your ultimate goal at the end? (4.0L?)
questions:
what is the girdle like compared to the 3.5L girdle? can you have it milled to use the 2nd gen oil pan?
i see on the parts you need that you said a 72 ac compressor bracket... i have a 72 bracket, but would like to get a 74 to just have a direct swap. let me know when you start mocking stuff up how everything pans out. im very curious. i will take lots of pics when i start mocking stuff up on my build.
i assume (as im sure you have) that a 72 oil/water pump will bolt up. you using the montero sr timing belt? or... i guess you are going with mivec...?
helluva build. brings more questions than it does answers at this point hahaha
well, Ray said it should be good for 4.2L, not sure at what bore he's talking when it gets further along I'll get both blocks ultrasonically tested to see what they are made of, I'm getting the feeling that your best just boring out a 74..but we'll let the tests do the talking
Going to grab a 72 AC bracket just cause they are easy to get, will then see what needs moving around etc and go from there, let me know if you find a source for a 74 one and I'll get one too
will see what I can do about looking over the girdle and rest of things this weekend, I assume it's the same as the 74 but I don't remember my 74 having the crank scavenge thing the same though..
I did dump the 3sx pan on top and it looks like it will fit, again there is still the dip stick and girdle grinding most likely.
The cranks seem identical between my Pajero 75 crank and the Eclipse 75 crank
Oh, and for the belt just the standard one will be fine, afaik the MIVEC cam's are the same size and height from the crank as the non mivecs (but of course I'll let you know)
here's the belt that came off:
oh no, i dont need anything, youre awesome though for all the documentation!!
i will keep an eye on the thread and progressively keep your mind on its toes i personally dont like the concept of getting bosses welded onto the block... not saying it wont work, just saying i wouldnt want to do it. its gonna be awesome if you get it all to work though. wiring up those mivec heads correctly will be interesting. they flow awesome though!
74 crank weighs more (to go with heavier pistons/rods)
75 block weigh's considerably less..BUT when the 380 guys (Australian version of the Diamante?Galant?) weighed their they found that it was heavier than my pajero one.
V77W 75 block is 43.1kg
Someone asked about the bearings...not sure who...
the 75 ones have 3 x openings for the oil to go through.
as you can see the block has a large valley cut in it push oil through to those extra openings
nothing to write home about on the girdle side of the bearing though (and I imagine they want this part to stay as large and flat as possible as it takes the big bang.
The Magna guys weighed their block (think I'm going to call it the second generation 75, more or less from 2006+) and it came out at 46kg as opposed to this ones 43, I'm guessing it's due to a fair amount of reinforcing the block bdrank has.
just waiting for some clean front shots of the 75 gen 2 block to see if all the 72 stuff will mount up to it too.
well, I measured the bores and wall thicknesses and all that rubbish
here we go
6g75
water passages (widest part) 10mm
edge of bore to inside of block 21mm
edge of block to inside edge of block (thinnest)138mm
water passage to bore ~8mm
water passage to edge of inside of block ~8mm
6g74
water passages (widest part) 12mm
edge of bore to inside of block 23mm
edge of block to inside edge of block (thinnest) 138mm
water passage to bore ~8mm
water passage to edge of inside of block ~8mm
keep in mind none of this is sonic...that will have to be in a few weeks or something (probably a month) pics showing my measurements are in the usual spot
one odd thing...check these pictures, the 75 block has a stepping on the bore side which in theory makes the the bore even thinner just after the top 6 or so mm...wtf?
pix:
75:
74:
unfortunately the 74 is so damn disgusting that I can't see if it has the step too, from what I could see while looking at it there wasn't anything..but weird!
I can do 74 and 75 but the 74 were pretty badly worn so i can only go off the very edge...
also one of the guys on another forum found the bearing thickness based off lettering stamped into the corner of the block, so i could just scribe this out and tell you off that and the manuals...your call?
Just checked, Same width
code on 6g74 D4H
code on 6g75 D5B A
17mm exactly
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