Just wondering if anyone has an idea of how hard it is to replace the heater core in my '86.  I think it's on its last legs so its that time.  Is this a do it yourself project or something for a shop?  Any thoughts would be appreciated.

http://www.c4vetteregistry.com/forum/forum_posts.asp?TID=64044&title=is-changing-the-heater-core-on-a-c4-really-that-bad check this thread out lenny. goes into a lot of detail about changing the core. also look through all the other posts in the heating and cooling forum as i be lieve there are more posts about it. good luck.

I did my 86 and it was a bit tough. I almost thought about pulling out the windshield to improve access! But my real problem was that the replacements I could find were not correct, so I suspect they changed the type/style at some point. Fortunately, I was able to read off the part number and cross reference it to a correct style at RockAuto.com. They shipped it to me and it fit fine.