I have an 85 bronco with the 300 6, 4spd. manual with granny low. I want to swap in a 351w 4b. It has to be carbed, because I like the thought of keeping it computer-free. Can you tell me what I need to do to pull this swap off? Any tips and tricks? Do I need a new bellhousing, flywheel, radiator, anything else? LAst thing, does anybody have an engine? Thank you for your help with this. jeff

 

Why don't you want EFI? It's more reliable, driveable, & repairable, and parts & mods are easier to find & install. Swapping to EFI is the best thing I've done to my truck, and I have a beautiful '96 MAF 5.8L in my parts truck...

Anyway, you'll need a V-8 radiator, engine perches, & flywheel. The bellhousing is the same.

 

Computer controlled, and wiring harness needed. All of this will involve more time and money to have put in. Unfortunately, I am not somewhere that I have the facilities or tools to do this myself. I have to have a shop do it. Otherwise I would take the time to do a complete swap like that. Thanks for the information though.

 

Steve i hafta disagree with you on the EFI. Reliablity i dont really know on(anyone i know aint had a efi truck long enough). Driveable i always did love to here a 4bbl in the mornin...wait did u mean gas milage if u did i prefer carb cause i can stick a 1bbl carb on a big motor and get decent gas milage..Repair able no... YOu have alot more parts to go wrong in fuel injection.. Plus if something does go wrong with a carb you can always fix it cheap and easy and if u need a new carb thats 20 bucks at the junkyard plus a rebuild kit which aint bad. now for the mods ya you got your cold air intakes but it wont produce as much power as a carbed vechile would

 

By driveability, I mean there's no fuel slosh in a bowl to affect how the engine runs cornering or at extreme angles, and it always starts. I can even roll start it on a mild hill in a few feet. High altitude doesn't affect it, and it runs fine while it warms up.

Gas mileage means miles per gallon - EFI is consistently more efficient than carbs, and over a much longer lifespan than a carb's. But you can't have a 1bbl AND a 4bbl on your engine - which is it? I get great mileage AND power from my EFI - you have to choose one.

Repairable - yes. Mine tells me which parts are having problems, and they're easy to get to, change, repair, or test. I have fewer parts - you have at least 2 jets; at least 1 needle; who knows how many adjusting screws, cams, pushrods, diaphragms, check *****, weights, rubber seals, brass seats, springs, levers, floats, butterfly valves, needle valves, & vacuum ports; all of which have to be correctly adjusted for the engine to run right under all conditions, and a slight vacuum leak or a little varnish will throw everything off. Mine will adapt to variations in sensors, or ignore a sensor that isn't sending a usable signal, and it adjusts itself constantly. It learns all the time, and adapts to how I drive to keep the engine running if at all possible. I've towed a trailer to a gas station as I ran out of gas turning 300 RPM.

Look thru a performance website or magazine and count how many kits/parts are available for your engine with a carb, and then how many are available for the same engine with EFI. Cold air is a good start, but the sky's the limit nowadays.

I bought my engine for $1100 with all the accessories, and everything on it is from the junkyard or the old engine, except the coil, cap & rotor, plugs & wires, voltage regulator, starter, belt, & A/C compressor. Any sensors I've swapped out are still straight from a junkyard, but in ~250,000 miles I haven't had to swap many if any. And mine still runs as well today (after ~80Kmi in the original truck, a wreck that broke both engine mounts, then ~250Kmi in my truck including who knows how many collisions & a full roll) as it did new. I put ~200mi per day on it, many towing, many doing 80mph, and I hit the trails every chance I get. (LOTS of fun last weekend! )

I'll never mess with a carb again, but if you prefer them, I wish you ALL the luck!

 

IF you want to put a v8 in the place of the straight 6 you will also need to get the proper frame mounts. They don't fit in the frame the same way. you also might have a cooling issue to address