Car covers are alright if the car is CLEAN when the cover is put on.If not when you remove it the trapped grit,dirt,and dust will scratch the paint.If you try to use one outside the wind will blow it around and do even more damage.
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04 GT
Handling - http://www.protoworks.com/cgi-bin/C-C_Wiki.pl
4.6 head
http://www.mustang50magazine.com/techarticles/23018_reworking_stock_two_valve_cylinder_heads/photo_01.html
Cover
