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Any difference in the 7MGTE head and the JDM 7MGTE head? Valves, porting, anything? Will a JDM head be a direct bolt-on and perform the same?

My dash oil pressure gauge is reading about 15 lbs low with an OEM Toyota oil pressure sensor that is less than a year old. I checked it with a mechanical gauge after a rebuild. I will check the gauge per the TRSM diagnostic spec. Other than replacing parts is there any calibration of the...

Just rebuilt. TRSM specs are 4.3 psi @ 650 RPM and 36-71 psi @ 3000 RPM Readings are ~8 psi @ 900 RPM and ~20 psi @ 2000 RPM+ During the rebuild I shimmed the oil pressure relief valve 7mm so pressure should be excellent. I checked the oil pump clearances and so did the machine shop. I...

89 MKIII 7MGTE- by the strut mount on the drivers side is the solenoid resistor. What does it do and is it necessary? I bought a car already modified and have rebuilt the engine. It appears whatever the solenoid resistor was connected to has been removed.