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Alloytec is more responsive, more powerful (and more powerful low down) and has longer service cycles.
Have you taken the rocker covers of a high Km alloytec??? I'd service them regularly too if it was mine. sludge build up isn't a good thing
I'd also be weary of worn timing chains, seems to be a bit of a issue as well. Not cheap to replace but if they do need doing you may as well throw in a set of cams from MACE whilst your at it.
Cheers