Correct head gaskets for 7 bolt 4g64

[bmxfelon420]

I just wanted to post the info for anyone who might be pursuing one of these swaps. Here's what you need to know when it comes to the head gasket:

First, you need to plug the holes in the block that arent in the head, because the DOHC head sits on the block differently than the SOHC head does and you'll be blowing crankcase pressure out of them. We just used freeze plugs and copper gasket maker on mine.

Second, if your block and pistons are stock bore, you need to use an 86.5mm gasket. I've heard Parts Dinosaur has these, but I got mine from Extreme PSI, it's this one: http://www.extremepsi.com/store/product.php?productid=18928&cat=0&page=1

You'll probably want to copper gasket maker in the holes on the gasket itself too that arent used, just to be sure it seals as well as it can. It fits perfectly on the bores. If you have any overbore at all, you can use a DSM gasket. I couldnt find an 86.5mm gasket made for a DSM as they are 85, 86, or 87 only. I have been told you can use the 87 with no issues but I wanted the exact correct size.

 

[Justin97spyder]

So the 63 head will just bolt on to the 64 block? Doing this swap in about a week. And stock 64 pistons are just fine?

 

[97_AWD_GSX]

I'm running a 1G 4G64 block with 2G head.. Using 8.5:1 wiseco pistons with 1G rods.. 1G ARP head studs and cometic head gasket.. All the holes lined up .. Just had to make cylinder head bolt holes on the 2G head bigger to fit.. And a lot of other stuff that had to be modified..

 

[donniekak]

I'm running a 1G 4G64 block with 2G head.. Using 8.5:1 wiseco pistons with 1G rods.. 1G ARP head studs and cometic head gasket.. All the holes lined up .. Just had to make cylinder head bolt holes on the 2G head bigger to fit.. And a lot of other stuff that had to be modified..

The 6bolt blocks need the 2 holes on the timing side drilled into the block to match the gasket and head.

 

[97_AWD_GSX]

Really didn't even realize that.. The ones on my 1G 4G64 block must of already been drilled out because all the holes lined up to the head and looked like the 2g block holes. .

 

[darknezz7]

So the 63 head will just bolt on to the 64 block? Doing this swap in about a week. And stock 64 pistons are just fine?

Yes it will bolt up. No you cant run the N/T pistons at boost (very long) you will have knock and blow them.

Lots of info compiled in my thread here, rest is in my build profile pages
http://www.dsmtuners.com/threads/in...o-build-with-questions.477110/#post-153433900
http://www.dsmtuners.com/threads/in...o-build-with-questions.477110/#post-153433900
http://www.dsmtuners.com/threads/sp...lt-tucked-engine-bay-street-show-vert.480442/

 

[familyMAN]

OEM composite for galant 4g64 dohc is working well so far with a SS oringed block. 87mm pistons.

 

[Justin97spyder]

Im not planning on boosting this year. Just need to get the car running for now. Will they work for a non boosted build for a while. Will get forged internals at some point. Just dont have the pockets for it right now.

 

[darknezz7]

Well yes they would work for n/a. For the trouble though you really might as well keep your sohc and wait til you can buy the pistons and some rods to do it right the first time.

Not sure it will gain that much with just the dohc and no turbo.