Hi,

does anyone know what are the differences between a 7 bolt 4G63T block( from 1997 eclipse turbo) vs. a 7 bolt 4G63T EVO VIII block?

are the crankshafts and rods the same? im sure the pistons are not. any other differences? coz im planning to build a short block for turbo use. I have a spare 4g63T ( from 1997 eclipse turbo) block just lying in my garage. if the crankshaft and the rods can be used for 400+whp then i can just buy ACL race rod and main bearings plus ... + EVO 8 head with hks camshafts..
thanks in advance for your comments


Max

 

Crank is the same, not sure about the rods.

 

Look up the part number for some eagle rods for evo and 7 bolts. If the part number is the same, you have your answer.

 

The block itself different. Where the transmission bolts to the block is completely different between the 2 blocks. The 2G block has only 4 bolts to hold the transmission on, and the Evo block has 5. I just did a motor on a 97 4g63, and on an Evo, and had both block side by side, and they are not the same. Hope this helps

 

You sure it wasn't a 6 bolt or a 1G 7 bolt in that '97? The 2G 7 bolts have the 5th hole for the trans like the EVOs. I know the alternator mounting provision is located sightly differently on DSMs, but otherwise a 2G 7 bolt and EVO bottom end are virtually identical. Back when EVOs first came to the US I remember people swapping built 2G engines into them because they were cheaper to build.

 

blocks are very different. wont interchange. transmission bell completely different on evos.

 

Thank ALL for you answer!
Tomorrow am add photos what difference i am found!

 

Thats what I was saying! I've worked on a ton of them!! Not even close to the same!!

 

differences:

evo VIII block
hi all!
4g63T eclipse block

 

evo block piston hole lubrication

eclipse piston hole lubrication
this is not problem but i am remove balancer shafts and modify oil pump but need big oil pressure...

difference in rods... evo rods is better..

eclipse turb piston

evo VIII piston

 

eclipse piston steel and big

evo piston aluminium and lightweight and small in height.. diameters are same

eclipse piston

evo piston back side

 

There is no difference in piston oil squirters between evo and eclipse. Your particular 7 bolt eclipse 4g63t just had the stamped oil squirters(worse) instead of the bolt in jets. As far as cranks they are the same and any eclipse between 98.5-99 uses the same thrust bearing design.

The guy above must have been working on a 1g or a 2g with a 6 bolt swap. The 6 bolt motors(pre 92.5) have only 4 tranny bolts. The 7 bolts have 5. However. On the front side of the block where the evo starter would go. The dsm 7 bolt's front 2 tranny bolts are too far appart to accept the evo starter plate/tranny.

Oil/water pumps should be the same. I could go downstairs right now since i have both blocks sitting waiting for builds.

Why on earth would anyone put a dsm 7 bolt in an evo is beyond me. Crankwalk>than cost of dsm 7 bolt savings.

If you wanna save some money instead of paying ridiculous evo block prices just get yourself a 4g64 out of an eclipse. Those blocks can be had for ~$100. So the money could go to better things. Like forged internal goodness.

 

eclipse piston height is big

evo piston height is small

evo VIII block transmission main holles

big problem need freeze to make this holes on eclipse block

detail seee

 

first bolt hole

this holles is big problem becouse it center transmission on engine block

what can I do?
Anyone have any idea???

 

Yupp, your pictures just showed everything i explained above. Those two front bolt holes don't line up on the evo tranny.