Out of interest here as we are going in depth on the modification side of the Zetec engine.

Mine is a black top 2.0 Zetec engine that has been serviced by ford every 8,000 miles with stamps and receipts to prove......So would my engine be ok for modding, she has done 114,211 miles and just had another full service! Also 1 previous elderly owner......When I took the rocker cover off to do the gasket the cams gleamed like mirrors......I was most happy

Thought I would add some pics!!

My engine.....