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[mkaminski100]

Can you please advise what’s the difference between GM C30SE and C30SEJ engines? I am not after performance, power or torque differences, but technical/build ones.
I know it’s old engine, but maybe I can get some help.

[Marks DTM Calib]

The SEJ was only fitted to the Carlton.

There appears to be no major differences at all from what I can tell

[mkaminski100]

So these are same engines? A friend of mine asked me this question, but I don’t know anything about straight 6 pots.

[Big Rod]

The SEJ was only fitted to the Carlton.

There appears to be no major differences at all from what I can tell

That's correct. The SEJ was fitted to the Diamond estates but while there's no discernable difference in the construction of the two, the SEJ 'officially' had less power!!!. Not a lot mind, I think IIRC it was only a difference of 5 BHP or so to take it below the 200 BHP mark.

I can only assume they detuned it in some way so as not to affect GSI sales! (Or not!   )

[Omegatoy]

there are slight differences in the ecu and a smaller exhaustalong with single pipe rear box, all designed to bring the torque in lower down to help haul the huge loads the estate is capable of carrying

[oceansoul]

the J stands for Throttled out put.

See here:
http://www.topbuzz.co.uk/info/engine_codes/engine_codes.htm