I just took possession of a all original 75 Royale convertible,350, 4bbl,with 86000 mi, I was wondering if anyone makes headers and a dual exhaust conversion for this year and model that will bolt right in. Any help would be apprieciated.

 

Bolt in, hmmm, no. I had a set for a 68-72 A-body laying around. I did heat and flatten a "tad" a 3 inch strip near the drivers-side frame where the brake lines/proportion valve area is. Minor flattening. I did heat wrap that tube area. 2nd area, where shift lever is I heated the area and used 1.5" solid round stock hitting it to make a rounded channel area for where the shift lever crosses. I heated the area before the driver's side collector, bending the collecor down a tad to clear cross member. Passenger side I moved the trasmission lines a bit. A little work here and there and they fit well, no rubbing. For the duals I got a Summit torque tube kit. I took the kit and collector end flanges to a "local" exhaust shop that I use and they bent the pipes and put on "life-time" guarenteed mufflers. So now I have headers, torque tubed 2 1/2" dual exhaust. I rebuilt my 455 engine, Comp cam's 268H cam, 0.456/0.456 lift, Crane ignition module, Edelbrock Performer intake, 670CFM Holley, Sat-nite(small)converter. Engine makes a lot of torque and it pulls strong. She moves out pretty good for a big convertible. In the picture you can see one exhaust pipe, other side mactches. Good luck, Ken GreenMachine.jpg