Bob, I just went out and looked, and very much to my surprise there are NO holes in the back of either head!!! I had to take the smog tube out to get to the top trany bolts and there is a flange that bolts flush to each head WITH a gasket on each flange. I never looked at the back of the heads even though it has been sitting on an engine stand for the past 9 months. Now I'm that I know the heads don't have the smog holes I'll just plumb the smog pump straight down to the converter, with of course all of the right parts. This will make life a little easier when/if I have to get it inspected. I am going to try and get the 360/727 put together next weekend and installed the following week. That's if I don't convert over to the newer 5.9L magnum heads, intake and serpentine belt system. Dave U. 81 Imp 94 -----Original Message----- From: mailing-list-owner@xxxxxxxxxxxxxxxx [mailto:mailing-list-owner@xxxxxxxxxxxxxxxx]On Behalf Of Bob Harris Sent: Sunday, June 22, 2003 1:02 PM To: mailing-list@xxxxxxxxxxxxxxxx Subject: Re: [-Possible SPAM-] IML: It's bite the bullet time Dave - After reading your post, I just had to reply. I removed the engine piping on the back of the heads of my 318 EFI Imperial several years ago. These pipes are not stainless and very likely to rust out. The big surprise to me to me was that there "were no air openings in the rear of the heads!!!" I was flabbergasted! I have had that car inspected every year and had no hose nor that pipe installed and the car runs fine when cold and easily passes the ever increasing requirements of the local laws. Take a look at yours and see what you have, we'd all be interested in your reply... Bob Harris '81 EFI car.