yeah m8, does sound like a duff belt, but have you got any alloy bit in your time area, i.e alloy cam sprocket???? this or other parts may have worn, and the belt stretched with it, so when a new belt is put on, it cant run on the wear without trying to move?? just an idea.
just an idea, coz i used to have a mk2 escort with a full race 1600 OHC sierra lump in, and i had a piper cam and piper alloy cam cog, and after a couple of years it had worn 50% of each tooth, quite a scary thought for an engine that revved happily to 9000rpm.
if all looks ok thou, i would go get another belt to compare with the 1st one you got.
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