"Except of course that the UK Zetec has an Aluminium head"
They all have an aluminum head, iron block.
Your car sounds nice and at 2640lbs Im sure its fast too. I'm amazed it is so light. The wts Ive seen for US zetecs is about 2750 (base) and up - easy to hit 2850 with some options.
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Dan
99SVT - Tropic Green
#554/2760
Stock - except minor intake, exhaust, & motor mount enhancements