Not sure I am understanding your post. 0.040" off the head is almost indistinguishable when installed. Your tension / idle pulley will make up for the fact that your cams are now 0.040" closer to the crank shaft.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)