Phase I JDM EJ25D?

[subikid90]

I have a JDM EJ25 swapped into my car by PO. They used the USDM heads and intake manifold. The car is a early 97 so it is phase I. My question is, was the JDM EJ25 phase I or II or did they have both like us? Is there a way to tell phase I from II besides heads/intake manifold, or tearing the motor down?

The phase I block as a different thrust bearing than the phase II which means you cant used most EJ257 internals.

BTW I have done my reading, I have read just about every EJ25D build thread on the internet. I have goals of a DD/auto x car using the block I currently have. Weather that means EJ257 internals and boosted or EJ25D upgraded internals and bump compression up to 11.5:1 area. I completely understand you cant have reliability, performance and low cost, you only get 1 or 2 lol. I want all of them, and if I can do sti internals I might just get it haha.

[mike-tracy]

Any competent machine shop would be able to modify your block to fit a phase II crank. But you CAN use STI pistons with a phase I crank, provided you either use your stock rods or go with aftermarket forged phase I ej25D rods. So I don't know what your JDM block is, but even some late EJ25D blocks were found to be phase II.

[MikeyMeyagi]

phase 1 blocks have 4 bellhousing bolts, phase 2 blocks have 8.

[subikid90]

Any competent machine shop would be able to modify your block to fit a phase II crank. But you CAN use STI pistons with a phase I crank, provided you either use your stock rods or go with aftermarket forged phase I ej25D rods. So I don't know what your JDM block is, but even some late EJ25D blocks were found to be phase II.

In late 97 or 98 they went to phase II in the ej25d. I was thinking about using the sti pistons and manley rods for the ej25d, just will cost more than I wanted it to.

[subikid90]

phase 1 blocks have 4 bellhousing bolts, phase 2 blocks have 8.

Thanks I will go look

[mike-tracy]

In late 97 or 98 they went to phase II in the ej25d. I was thinking about using the sti pistons and manley rods for the ej25d, just will cost more than I wanted it to.

The 4 1998 EJ25d's I've owned have been phase I. I believe it was 99, and then only some of them - were phase II.

[MikeyMeyagi]

yes, i have a 99 outback here with the phase 2 4eat and 8 bolt bell housing

[subikid90]

My 98LGT had the phase II motor. Had the new style coil pack if I recall. I thought that was the way to tell if it was phase I or II. Maybe I am totally wrong though lol.

I have an 01 LGT with the EJ251 that I may swap shortblocks with so I have a better motor to build. Or maybe I should just quit being cheap and buy an sti shortblock lol