85 rb header on 81?
 

does it fit? did quick search, no finds, jsut need a quick yes or no b4 i buy header/presilencer

I had a 84-85 header to go on my 83. The header will fit if you get the 84-85 presilencer. The 81-83 presilencer have bigger studs coming out of it. It won't fit the 84-85 header. Learned the hard way. I would get the correct setup for your year car. HTH

Well remember if you have the parts already a welder can make anything fit.

But try to get the correct setup first.

Provided the 84-85 isnt an SE with a 13B.