Originally Posted by
mberndt
Do a compression test...
The ITR should have higher compression numbers, as it has higher compression pistons...
Did you look at your IM?
If it has the IAB system then it's a GSR motor not an ITR...
Also, if I'm not mistaken, the ITR has dual valve springs on both the exhaust and intake valves, whereas the GSR motor only has dual springs on the intake valves...