Doug's headers fittment
I have them in my Duster with a 340. 833 4-speed with mechanical linkage, flaming river manual steering box, mini-starter, milodon road race pan, and stock V8 spool mounts with polyurethane inserts. I had to modify the z-bar (same as the TTI modification), and both sides needed some dimples to fully clear the 1.12" torsion bars I have. I also trimmed the corners on my 4 speed bellhousing, which is also mentioned in the install instructions if I remember right. I had to trim that back even more for the TTI shorties.
I really like the Doug's. The ground clearance is the best you'll get with long tube headers, they're better than the TTI long tubes by about 3/8". Not only that, but the Doug's give up less than 3/8" ground clearance even compared to the TTI shorties. I actually bought a set of TTI shorties and had them mostly swapped onto my car when I decided that they weren't any better for clearance than the Doug's (just different tight spots), and I switched back. I did a write up of that swap, and swap back, in my build thread here My "new" '74 Duster- or why I need a project like a hole in the head. After seeing TTI's in person I'd buy Doug's every single time. The TTI's were not all that impressive, especially considering the additional costs.
Because I also have the spool mount K there's no good way to shim the engine to adjust clearance either, so, if you have the earlier biscuit style engine mounts you may be able to adjust things a little better. Believe it or not, if it weren't for the 1.12" torsion bars I wouldn't have needed to dimple the Dougs at all. Just a little trimming on the bellhousing corners and everything would have been fine.
Here's a couple of pictures underneath. The driver's side is before I trimmed the end of the tab on the bell back a little, you can see that there's pretty much no extra room anywhere with the 4 speed linkage, large torsion bars, and milodon road race pan. Although honestly I don't know how you could route pipes through there any better, I think the Doug's manage it about as well as it can be done with long tubes. They pretty much have to be right where they are, moving them away from any of the tight spots would make them interfere somewhere else. The passenger side is after I trimmed the little tab on the bell back, I did the same on the driver's side later. It also shows my remote oil filter set up, I have a shorty filter on there now with no 90* adaptor, it fits fine. Both are before I added some small dimples in the headers to add some torsion bar clearance. My car is pretty close to worst case scenario though, I mean, outside of adding power steering I'm not sure there's anything I could do to reduce space for headers any more than I have already.
I have them in my Duster with a 340. 833 4-speed with mechanical linkage, flaming river manual steering box, mini-starter, milodon road race pan, and stock V8 spool mounts with polyurethane inserts. I had to modify the z-bar (same as the TTI modification), and both sides needed some dimples to fully clear the 1.12" torsion bars I have. I also trimmed the corners on my 4 speed bellhousing, which is also mentioned in the install instructions if I remember right. I had to trim that back even more for the TTI shorties.
I really like the Doug's. The ground clearance is the best you'll get with long tube headers, they're better than the TTI long tubes by about 3/8". Not only that, but the Doug's give up less than 3/8" ground clearance even compared to the TTI shorties. I actually bought a set of TTI shorties and had them mostly swapped onto my car when I decided that they weren't any better for clearance than the Doug's (just different tight spots), and I switched back. I did a write up of that swap, and swap back, in my build thread here My "new" '74 Duster- or why I need a project like a hole in the head. After seeing TTI's in person I'd buy Doug's every single time. The TTI's were not all that impressive, especially considering the additional costs.
Because I also have the spool mount K there's no good way to shim the engine to adjust clearance either, so, if you have the earlier biscuit style engine mounts you may be able to adjust things a little better. Believe it or not, if it weren't for the 1.12" torsion bars I wouldn't have needed to dimple the Dougs at all. Just a little trimming on the bellhousing corners and everything would have been fine.
Here's a couple of pictures underneath. The driver's side is before I trimmed the end of the tab on the bell back a little, you can see that there's pretty much no extra room anywhere with the 4 speed linkage, large torsion bars, and milodon road race pan. Although honestly I don't know how you could route pipes through there any better, I think the Doug's manage it about as well as it can be done with long tubes. They pretty much have to be right where they are, moving them away from any of the tight spots would make them interfere somewhere else. The passenger side is after I trimmed the little tab on the bell back, I did the same on the driver's side later. It also shows my remote oil filter set up, I have a shorty filter on there now with no 90* adaptor, it fits fine. Both are before I added some small dimples in the headers to add some torsion bar clearance. My car is pretty close to worst case scenario though, I mean, outside of adding power steering I'm not sure there's anything I could do to reduce space for headers any more than I have already.
