4G63T DOHC head swap into a 4G64 block!!

[Blackboost]

This is for those of you interested in swapping in a 4G63T DOHC head to your SOHC 4G64...;)

http://www.geocities.com/awd92gsx/dse4g64swap.html

This VFAQ comes curtesy of fellow member Curt "Spyder4G64T".

Enjoy!!

[Raycer97]

Just to let you all know, I will be posting step by step instructions, pictures, and complete parts list for the DOHC swap. It will be at http://4g64.wraithnet.net when it goes up - if you have any questions on the mod, feel free to email me.

-Travis

[PaPaw]

Sir,
I am a new member and you have answered my first question, that is will a 4G63 head fit my 4G64 motor. However, reviewing the parts list raised an additional question. That is, there seems to be 10 head bolts required but the parts list only shows two. On the same line there is printed 8X1. Does this mean the conversion required two MF240051 bolts and 8 stock bolts?

PaPaw

[greathuskie]

why not get ARP head studs

[shadowwraith]

Check out the new parts list for this at http://www.4g64performance.com

That should answer any questions you have.

[kiwi]

could you please e-mail me the conversion for my 4g64
havin hard time finding it and will i have to adjustmy computor
to suit these mods gredpath@ihug.co.nz

[Frankie Figs]

What would the compression be on a stock 4G64 shortblock with a 4G63 head be?

[LSR Mike]

I dont' have the answer to your question but I do have some info to help you find out.

Stock 4G64 C/R is 8.4:1 the stock head (SOHC 8 Valve) is 68.8 CC's. What iis the CC measurement of your 4G63 head? go from there. I suspect you will find them close.

[Frankie Figs]

I didnt know the compression was that low on the stock 4G64

[Iceman21]

that is .1 lower than a stock 2g 4G63. Not that big of a deal.

[Asmodeus]

Its not. The 7 bolt 16v 4G64's are 9.5-1 Or 9-1. The "SA" pistons are 9.5-1 ~ the "S" are 9-1. Might be the difference between 6/7 bolt.
If you read the 4G64 swap thread its all in there...
But it is eleventy million pages.
The cc's are the same on the 4G64 16v SOHC head as the 4G63T head.
Compression is unchanged.
The DOHC 4G64's of 94' (4G64K) Use 10-1 CR pistons.
But that's the only one.
6 bolt 4G64's may be different.
But I believe they are 9-1.
(These would be from a Hyundai)

[DOHC_Starion]

links not werking for me :eek:

[OddRob]

Both the top links are broken.

[OddRob]

http://4g64.150m.com/

Theres a good link for you's.

[manwithaGSX]

I have recently taken ownership of a 95 galant ES..has a 2.4L 4g64 SOHC engine. i'm not wanting to turbo charge it, but i was wanting to get as many NA horses out of it as I can. would putting bored out 4g63 DOHC head be worth it? or can I see similar gains by getting machine work done on the head that is already on there?

[Spyder4G64T]

DOHC Swap: Not really much for gains, depending on your needs. The ONLY gains you would see would be probably 4500RPM +. For most driving you would probably lose power.

If you want to stay NA, then I would replace the restrictive air filter system with a high-flow filter, and replace your cat-back with a 2.5" exhaust. Past that, the gains are minimal, and expensive.

[aquito]

nice info...

[96gst4g64]

does it matter if the 4g64 block was dohc compared to the sohc?

[magna]

No, blocks are same

[Spyder4G64T]

The blocks are *NOT* the same. There is extra work you need to do if you put a 4G63T DOHC head on a 4G64 SOHC block. There are some oil drain passages that need to be blocked off. See my website for links to the details.

[96gst4g64]

i got the dohc 4g64 and tried to used a sohc oil pan from but it didnt fit. anybody have one for sale? i also have a 2.4 sohc 4g64 for sale if anyones interested. send me a pm. i live in san diego so shipping may be an pain.

[Spyder4G64T]

i got the dohc 4g64 and tried to used a sohc oil pan from but it didnt fit. anybody have one for sale? i also have a 2.4 sohc 4g64 for sale if anyones interested. send me a pm. i live in san diego so shipping may be an pain.
Are you saying you have the actual DOHC 4G64 from a 1994 Galant GS?

[96gst4g64]

ya thats the one i got. why?

[Spyder4G64T]

There is very little info out there about that DOHC 4G64. That was the only year, and only car, that it came in that configuration. I'm afraid there aren't going to be a lot of people who know what's going on. One thing I can tell you is that the stock compression ration on that thing is 10:1, so I hope you're planning on rebuilding it with new pistons/rods. It doesn't make a great candidate for turboing in its stock configuration. You planning on putting it in your Spyder?

No idea why the oil pan wouldn't work. The 7-bolt pans are all pretty much the same. What about it doesn't fit?

[Asmodeus]

^ Listen to this guy.
He knows exactly what he's talking about.

The DOHC 4g64 picked up an extra 20 hp from two things.
#1. 10-1 compression VS 9.5-1 compression.
#2. Switching to dual cam configuration.

Spyder wrote the book on this shit before there WAS one.
Do whatever he says.

:cool:

[96gst4g64]

ya i dont know why it didnt fit either. its about a half inch too short in width so it doesnt make up to the other side. I am going to take the block to a machiene shop hopefully by next week but i still dont know what pistons i am going to use because of the fact that it is the dohc galant model short block and no one uses that one. lol hows that for a run on sentence. Anyway, its not going in my spider, its going in my eclipse. I am probably going to end p using 1g rods with some nice forged pistons. if you got any input hit me up. anybody with answers shoot me an email gwynnman19@yahoo.com.

[Asmodeus]

Being that it was from a 1994 Galant GS this engine is a 7 bolt
configuration. :rolleyes:

If I hear one more person say "yeah I'm gonna use 1g rods"
I'm going to crawl thru the screen and twist their head off.
:wall:
You can use whatever 4g63 piston you want in the proper oversize.

Fucking READ. All this stuff has been discussed in tremendous detail
in the 4g64 swap thread and Spyders own website. Not to mention the fist full of threads in which people are doing a full buildup on their car using a 2.4l.
Do some research. IT IS ALL ON HERE. Search!
:wall:

[96gst4g64]

thanks for the ted ass comment. the problem is that the galant gs and es have different rods and compression and since no one seems to use the dohc block i want to make sure the big rods will wok. if you got part numbers it would help. ive already looked at the other threads and at the wieseco site the 4g64 block doesnt mention the gs model.

[Asmodeus]

Its still the same crank and block.
You can't use 6 bolt rods, in a 7 bolt engine.

I just flat out told you and you still didn't get it.

[96gst4g64]

ok, thanks for telling me that. about ten people said that they would work so i wasnt sure.

[Asmodeus]

Maybe they have it on a technicality.
Technically you can machine the hell out of the rod
(and defeat the entire purpose of using it because its stronger)
and make it work.

But as I just said. This is stupid. By machining them down you
lose the added strength. *pointless*

I highly doubt the rods are different on a 4g64K motor. (dohc)
As the rods are the same between the 4g63 and 4g64.
The piston I believe is where the increase in compression is.

The block will have an additional 8mm in deck height.
And there's more throw in the crank. (ending up with 100mm stroke)
VS 88mm in a 4g63.

You should be able to use any 7 bolt rod from a 4g63.
And any 2g style piston in the proper bore.

I have the ecu sitting here for this engine. (2.4l DOHC 1994 Galant GS)
If you end up using it straight up. N/T (a sohc ecu won't drive coil packs in a n/t Galant)
I also have the factory service manual for the car.
:P

[96gst4g64]

thanks for the help. ill prob have more questions later... lol

[Spyder4G64T]

First off, although I've never seen one, I'd be pretty positive that a block from a 1994 Galant GS would NOT be the same as the rest of the 7-bolt 4G64's out there. It would likely look more like a 4G63 with a higher deck.

Oh, and it's 6mm, not 8mm. Try your math again. :)

It's very likely that engine is going to be very unique in a LOT of ways, so don't discount the questions the guy has.

[96gst4g64]

lol. i think im going to sell the fuckin block and just buy another gst block. this seems to be alot less stressfull.

[Asmodeus]

Yes yes, 6mm...
And the passage ways are there.
Any of the ones I had apart looked like a 2.4l except for the passage ways.

Rods didn't look any different than any other 7 bolt 4g64.
?

Maybe I didn't look close enough.
I'll have to dig thru my "garbage pile" and see if I can find them.
I don't use stock 7 bolt anything so... it gets tossed.

[96gst4g64]

check out my blown motor! http://www.dsmtalk.com/gallery/showphoto.php?photo=7301&cat=500&ppuser=43420

[Boxcarracer944]

http://4g64.150m.com/

Theres a good link for you's.
Helped me out a lot.