I've been running the car like this for 2 years now, so I know my internal swap is fine. I got a new glo-plug, and it's fine.....but the plug is like....half a millimeter too long somehow, so the piston hit it a couple times....no damage, but it obviously seized. The sleeve came up out of the bore a bit. But unscrewing the plug even a bit loses all compression, so I'll need a different sized plug.
The bigger fuel return line I put in helps with the vacuum as well. If I still have problems I"ll tear down the entire motor, and rebuild.
Resident Mechanical-Automotive Engineer, B.A.Sc., P.Eng.
Integra: 173whp, S5: 380awhp