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Originally Posted by interex
I'm not exactly sure how to go about using the 1G head on the 4g64 block, I'm not sure about how to get the turbo setup on the 4g64 block, I'm not sure how to just migrate over to the 4g64 and it has me a little curious if its even worth it.
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The blocks both come from the same base casting. There are a few differences once the engine is finished, but basically everything except the deck height, mains girdle and the absence of piston oil squirters is the same.
Quote:
Originally Posted by interex
Will a 98-00 4g64 crank fit in a 95-97 4g64 block?
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It should, all 7 bolt cranks are supposedly interchangeable. Even the Evo's.
Quote:
Originally Posted by interex
I saw that I need to fill/plug 5 holes on the 4g64 deck, used for oil return from the SOHC head, not used for the DOHC head... After that is done will my 1G DOHC head bolt right down onto the 2G(a) 4g64 block?
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The best way to plug those drain holes is for a machinist to drill them slightly oversize and tap at a depth where a threaded plug will sit slightly below the deck surface. Most people don't tap them however and just drill to a depth and diameter for a freeze plug.
There are two head locating dowels on opposite corners of the deck, these will place the cylinder head correctly no matter which head you use, the only minor issue is whether you're using a 6 bolt head or a 7 bolt head. The 6 bolt heads used a 12mm bolt, 7's use 11mm. You could just install the 11mm, however this will put slightly more strain on the 12 point nut used top side on the new studs you'll be using. Maybe overkill, but drilling and tapping the block to accept the 12mm studs would be more ideal.
Quote:
Originally Posted by interex
Okay, I wasn't thinking about the different blocks having the Girdle or not. Would a 4g63 Girdle fit a 4g64?
I do think I'm going to go with a 95-97 block if possible unless someone can show me that a 98-00 block will fit and work the same without any real large mods.
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Only use the girdle that was originally paired with the block unless you plan on a mains align honing while at the machine shop. Frankly I think this would be a big mistake. The 4G64 girdle is VERY stout and already has the proper clearance for the 100mm crankshaft. No additional grinding and clearancing which weakens the mains is required.
I'd also like to point out the already mentioned split thrust bearing design which will not be found on the 95-97 blocks you're referring to. This design is used in the Evo VIII, IX, and in all 4G63's and 4G64's built after 1998. It has been referred to as being Mitsubishi's solution to the crankwalk issue of the 95 up to 97-98 blocks. Whatever the issue was, the changes seem to have worked because crankwalk is almost completely unheard-of in 99+ blocks.
Below is a picture of the girdle from my 2003 Galant 4G64, and a pic of the dowel pins which locate the head.