After beating my head against the wall (forcefully I might add) I have finally finished rebuilding a 99 (Phase 2) EJ22 for a customer. Along the past month and a half, I have discovered some differences that I'd like to compile on here, along with submissions from other engines so people can have a single resource to find intel on these engines.
In other words, let my struggles be of some help to others.
1999 Subaru Impreza 2.2:
Uses different piston rings than previous EJ22s. 1.2/1.2/2.5 as opposed to the standard of 1.2/1.5/3.0 for the ring width. See; Hastings 2C5167. I got mine from RetroRoo (ShawnW)
Timing belt tooth count is +3 over standard phase 1 EJ22: 47 passenger cam to crank, 43.5 crank to driver cam. Standard is 44/40.5.
Uses SOHC 2.5 valve cover and intake manifold gaskets.
Uses hotter plug (OEM spec) than earlier EJ22: BKR5E11 NGK
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Guest Message by DevFuse
(Beginning of) comprehensive guide to EJ22 differences among model years.
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