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Four barrel conversion

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

44 photos
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1981 Ford Bronco - The new aluminum Offenhauser dual port intake. 1981 Ford Bronco - The intake with the heated spacer. This particular spacer is designed to run coolant underneath the carb to prevent it from icing, especial… 1981 Ford Bronco - Setting on the Holley 390. No point in bolting it down yet. That's the last step. 1981 Ford Bronco - Here's the Holley 390 sitting next to the stock Carter YF 1bbl. I've heard conflicting stories to the size of the 1bbl, but it's generally… 1981 Ford Bronco - The size difference of the venturis is easily visible. At least it should be. 1981 Ford Bronco - My brother working the grinder while we made a new accelerator bracket. 1981 Ford Bronco - The custom accelerator bracket bolted to the manifold. I used the bolt holes that normally bolted the intake to the stock 1bbl exhaust. 1981 Ford Bronco - Here's a shot of the mostly stock engine bay. The only thing in this picture that isn't completely stock is the EFI 300 exhaust manifolds.… 1981 Ford Bronco - Another shot of the stock engine bay with a view of the engine working necessities. My brother makes his own beer and brought some over for… 1981 Ford Bronco - Another view of the mostly stock engine. 1981 Ford Bronco - Here's the mess and tangle of vacuum lines that cover the intake and exhaust. 1981 Ford Bronco - Air filter removed with the stock carb visible. 1981 Ford Bronco - All the lines and hoses have been pulled out of the way, allowing for a clean access to the intake. 1981 Ford Bronco - The intake removed giving a clear shot of the dual exhaust manifolds of the EFI 300. MUCH better than the restrictive six-to-one stock 1bbl… 1981 Ford Bronco - Here's the new intake in place. 1981 Ford Bronco - Me working away while my brother supervises. This picture is interesting because it shows how the intake is designed to keep the carb flat… 1981 Ford Bronco - Getting all the manifold bolts nice and tight. As with any new part, it's always a little nerve-racking.... 26ft lbs, one at a time. 1981 Ford Bronco - Awww....his Jeep looks so tiny. Another awesome straight six. The 4.0L high output. 1981 Ford Bronco - The custom made accelerator bracket. Cost about $6 for the steel. 1981 Ford Bronco - Everything's in place, the lines are hooked up, and it's ready to go! 1981 Ford Bronco - Putting on the last, and final touch after we tuned it. It is time for a test drive. 1981 Ford Bronco - Later found even more vacuum lines that I didn't need and removed them. The simplicity is great. 1981 Ford Bronco - Engine bay view of an older Ford with a V8 engine topped by a chrome round air cleaner and a four-barrel carburetor. The valve cover and bl… 1981 Ford Bronco - Close-up of a V8 engine bay showing a chrome-topped K&N air filter mounted on a Holley carburetor over an aluminum intake manifold, with ex… 1981 Ford Bronco - Installed a kit to make changing the secondary springs much easier and faster. Highly recommended for custom tuning. Previously, changing t… 1981 Ford Bronco - Close-up engine bay view showing an aftermarket Holley carburetor mounted on an Edelbrock aluminum intake manifold, with spark plug wires,… 1981 Ford Bronco - Close-up of an engine bay showing an inline-six or V-configuration engine with a chrome-topped carburetor mounted on a cast-aluminum intake… 1981 Ford Bronco - Engine bay of a red Ford truck viewed from the front with the hood raised, showing a V8 engine with a chrome-topped carburetor, air cleaner… 1981 Ford Bronco - Engine bay of a red 1980s Ford Bronco/F-Series with the hood raised, showing a V8 with a carburetor, air cleaner removed, and various vacuu… 1981 Ford Bronco - Close-up of an Offenhauser 'Dual-Port' aluminum intake manifold installed on an inline-six engine, with a 4-barrel carburetor adapter/space… 1981 Ford Bronco - In the midst of a project so thought I'd snap some pictures of my custom accelerator bracket. The gold clip is for an aftermarket cruise co… 1981 Ford Bronco - Simple but effective. Not pretty but you can't see it anyway. 1981 Ford Bronco - ((The gold bracket is for an aftermarket cruise control kit.)) 1981 Ford Bronco - The alternator and smog pump bracket on some years gets in the way of the intake. Fortunately, mine didn't have any clearance issues. 1981 Ford Bronco - When removing the exhaust manifold, I do need to remove the stud from the block on the furthest hole to be able to have enough clearance to… 1981 Ford Bronco - Close-up of an engine bay showing cast aluminum intake or exhaust components with mounting bolts, along with rusty cast iron parts, black r… 1981 Ford Bronco - A very close fit. 1981 Ford Bronco - A clear plastic organizer box filled with various small metal and plastic automotive parts, including springs, brass fittings, and some lar… 1981 Ford Bronco - A clear plastic organizer box containing various small metal and plastic parts. The top compartment holds several small metal fittings and… 1981 Ford Bronco - A plastic organizer box filled with various small metal parts, including springs and what appear to be fittings or valves. The box is place… 1981 Ford Bronco - A white plastic organizer box is filled with various small metal parts, including what appears to be carburetor jets and possibly some gask… 1981 Ford Bronco - A clear plastic organizer box filled with various small metal parts, many of which appear to be brass fittings and carburetor jets. The box… 1981 Ford Bronco - A clear plastic tackle box with red latches sits on a dark wood table. The box appears to be dusty and has multiple compartments. 1981 Ford Bronco - A clear plastic organizer box with multiple compartments, filled with various small metal parts, springs, and fasteners, rests on a dark wo…