Has anyone that has bought used Macs had problems with them in and bolt down? I have heard from the 5.0 crowd that they warp after being used.

Thanks
Jeremy

 

We took MACs off my car and stuck them on another car the same day... no problems at all.

http://www.bfranker.badz28.com/fbody/exhaustday.htm

 

I sold a set of used MAC headers that did not have any problems. I would highly recommend getting them Jet Hot Coated.

 

mine were fine and they were used

 

Because there is not one solid flange, they can warp a little, but it's not a problem changing vehicles with the MACs. It's that same thing as if they were removed and placed back on the same engine.

You may have to clearance out a bolt hole or two, but they should work fine.

Dan

 

Just be careful. I bought mine used and I had to have a little fab done to get them to fit. I took them off a few weeks ago to do some engine work and they did not fit right when I went to put them back on.

They are jet hot coated also. Do not put non coated headers on your car or you will sorry.