I'm trying to install a Xenon front air dam on my 280z. In order to do that I have to take the original lower valance off. And whenever I try to take the bolts out the just spin and i have no idea what to do

 

 

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Dremel zip disc on the bolts will cut them off clean....

Try to get a tool on both ends of the bolt and nut. You may have a rust through situation at the connecting points. A Dremel is a good idea but keep it from doing collateral damage could be an issue. Since you are trying to put on an aftermarket body part there could be an issue with your installation. Some of your current connecting points will or may be needed to secure your air damage properly so you don't want to damage them. Good luck.

Those two 10mm on the ends by the tires are a PITA.

I had to cut mine off with just the blade off a hack saw. It did scratch the paint though but I've yet to get it painted anyway.

That very front scoop I left on. It reinforces the new spoiler. I had to go back and put it though. I ran it to over 100 and could feel the new one vibrating.

Edited June 14, 20178 yr by siteunseen

Maybe this will be better picture. 

It's a shot from the ground up. Spoiler at the top, skint lip, splash pan.

Read step 1 in the link: https://fiddlingwithzcars.wordpress.com/260z-air-dam-and-front-bumper/