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4G64 Block & 4G64 DOHC Head

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Any 7 bolt 4g64 will work if you want to go that route. Be cautious that The 2000+ 4g64 in the Eclipse is not the same as prior blocks used in the earlier Eclipse. The same goes for the Galant, they started using a different design on the 4g64 block around 99 or so. I've mentioned it in my "4g63/4g64 swap" thread.

Yes you can use a 4g63 DOHC head on the block. If you use a 4g64 block from 95+ then you'll need to insert freeze plugs (or other means of sealing...) into the deck surface in 5 locations (also mentioned on my thread) because the DOHC head does not use these and you will have bad issues if you don't.
 
How should I know for sure which 4G64 block will fit in place of my 4G63 ? What are those differences?
Mitsubishi Sirius engine - Wikipedia, the free encyclopedia
1987–1990 Mitsubishi Sapporo
1988–1996 Mitsubishi Van
1990–1992 Mitsubishi L200
1990–1996 Mitsubishi Mighty Max
1986-1998 Hyundai Grandeur
1993-1997 Mitsubishi Expo
1994–2003 Mitsubishi Galant
1996–1998 Mitsubishi Magna
1994–2006 Mitsubishi Spacegear (2WD Version)
1996–1999 Mitsubishi Eclipse Spyder GS
2000–2005 Mitsubishi Eclipse RS & GS
2003 Mitsubishi Outlander
2005 Mitsubishi Zinger
1989–1991 Hyundai Sonata
1990–1992 Dodge Ram 50
2001–2005 Chrysler Sebring coupe/Dodge Stratus coupe
2004-present Brilliance BS6
2008-present Chery V5
2006-present Great Wall Hover
2006-present Great Wall Hover Pi
 
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