What's the difference between pre 89 and post 89 engine block?

[zurud]

I have 90 supra turbo that's over 220k miles. My compression ratio is 150, 145, 140, 160, 160, and 165. My valve seal is leaking bad. My plan is to rebuilt the engine. I have an 88 7mgte engine as a spare engine that I plan to rebuild. My question is can I use the 88 engine? 88 engine has square motor mount and mine ( 90 ) has round motor mount. I don't want to spend on the rebuild only to find out later I have to use 88 motor mount and subframe. I don't want to pull my engine right now because its still running only smoking. Is the bolt mount the same on these engine?

Thanks

 

[Nick M]

IJ has pictures of the two blocks. More beef, probably practice for the upcoming 2JZ.

 

[IJ.]

Early casting number is 324 Late is 040528A.

The Major visible differences are highlighted in the pics!

 

[bowsercake]

I'm pretty sure my 90 engine block does not have the extra ribs on the block. Not sure if it is original but it has the 7m crank not the 6m crank so I bet it is. So, just because you have the 7m crank doesn't mean you have the updated block.

 

[3p141592654]

My 90 has the new block. It has a production date of 12/89.

 

[marc3]

hey ij, i have an 88 block from japan(well, the chopped up harness had the green plugs) the casting # is 810 or 018. and also says 7m0095246 below.
i also have the extra ribs and wider pan ribs, but the the 6m crank.
would this have to do with it coming from japan?

 

[marc3]

My 90 has the new block. It has a production date of 12/89.

where does it say the production date on the block?

 

[IJ.]

Marc: NA or GTE?

NA's got the thick block earlier for some odd reason.

 

[marc3]

gte sir, forgot to mention
ah well, guess that can't be a bad thing! was there any other car that had a 7m in japan , other than the cressida?

 

[IJ.]

Soarers came with a 7M.

I've never been able to pinpoint exactly when they changed over and you've added to the confusion

 

[j3pz]

where does it say the production date on the block?

id like to know this as well. i have jdm 7mgte with mostly grey connectors (89+?)

 

[3p141592654]

I meant the car, which presumably means the block was built on or before 12/89, most likely before.

 

[CPT Furious]

I just went and looked at both of my blocks and did a happy dance, Ian!

 

[IJ.]

I just went and looked at both of my blocks and did a happy dance, Ian!

LMAO Lane I hope you were clothed while dancing! :aigo:

 

[Poodles]

same with the heads, there are two different castings...

who knows when the transition was, it's odd... makes me wonder if two factories where making them later or something (I'm sure the beefed up block had soemthing to do with type-A racing though...)

 

[IJ.]

2??

try 10+ my new head is a #16

 

[Poodles]

only seen two distinct different castings (port changes where minor)

 

[IJ.]

They're all casting revisions while the ports may not be different the internal structures are.

 

[zurud]

It looks like the motor bolt hole are the same. I guess I can put my 88 engine in my 90.
Thanks

 

[IJ.]

All the mounts are the same Z.