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Exhaust Upgrade

From 1981 Ford Bronco “Spartan” — documented by AbandonedBronco.

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1981 Ford Bronco - These pre-shaped pieces showed up in the mail. The fact that the tailpipe was made specifically for the Bronco and the Y-pipe for the EFI m… 1981 Ford Bronco - The new cat and muffler. 1981 Ford Bronco - Here's a pair of used EFI exhaust manifolds I pulled from a friend's Bronco with a 4.9. It took us nearly five hours to get them off after… 1981 Ford Bronco - A picture of the restrictive six-to-one exhaust outlet on the carbed 300. The pipe in front is the EGR pipe that routes up to the EGR space… 1981 Ford Bronco - A picture of the intake and exhaust ports on the 300. Despite the fact that it took five hours to remove the exhaust manifolds from the don… 1981 Ford Bronco - The new versus the old. I had to cut the old exhaust off with a hacksaw. Nothing hard, just time consuming and tiring. The size difference… 1981 Ford Bronco - A size comparison between the old and the new exhaust. Old = 1 7/8" (2.76 square inches) New = 2 1/2" (4.90 square inches) A 77% increase i… 1981 Ford Bronco - I couldn't get a picture of the inside of the cat, but this is the inside of the muffler. Those are chunks and pieces of the old cat in the… 1981 Ford Bronco - Some friendly help while I'm busy working. I'm sure he was excited to find a lap to sit in outside. 1981 Ford Bronco - A picture from a later date, but this shows how I replaced all of the original manifold bolts with high grade hardened studs. This made the… 1981 Ford Bronco - A picture of the exhaust in place and everything hooked up. 1981 Ford Bronco - A picture from underneath the Bronco of all the exhaust in place. It was so sturdy and strong I could lift my entire body weight off of the… 1981 Ford Bronco - The premade tailpipe had a very nice snug fit. I'd heard complaints of aftermarket tailpipes generally hanging too low, but I was very plea… 1981 Ford Bronco - On the stock setup, the exhaust manifold supplied heat to the intake manifold to warm up the carb and prevent carb icing. Since the EFI man… 1981 Ford Bronco - A trip to the plumbing store supplied me with the extra fittings and hoses I needed to complete the intake warmer. I needed to extend the p… 1981 Ford Bronco - Some Indian Head Gasket Shellac really sealed up the threads and gasket. Unfortunately, I found that the smog pump also pumps air into this… 1981 Ford Bronco - A close up of the coolant heat bolted on. For anyone doing this swap, be sure to thoroughly clean out the intake where this bolts on or the… 1981 Ford Bronco - The last modification I needed to make was the original EGR pipe. The carb EGR pipe exited towards the tire and then routed up underneath t… 1981 Ford Bronco - The Mr. Gasket #260 is the best intake/exhaust gasket I've found for the 300. 1981 Ford Bronco - Close-up of an exhaust manifold part, showing the part number E7TE-HD 9B110 and some repair work. 1981 Ford Bronco - The EFI manifolds needed a little grinding to fit with the Offenhauser intake. It wasn't a lot, but it was enough to keep the intake about…