yo,
Take measurements of what you have in the Bronco such as engine mount to engine mount and while at the mounts, see what needs to be done to fit the Hemi that area.
Get the Hemi measurements incl weight and compare to your engine. Also need height w/throttle body installed and rear vs front sump ( a main reason why Early Ford hot rodders used chevy Engines in Ford frames). etc.
See what Quint did in his swap; figure on the engine/trans info
by Quint C (Quints Bronco Project) - 78 Bronco transformation w/2004 F-150 Supercrew 5.4 Triton engine, transmission, firewall section, dash, transmission cross member mods/mount mod, wiper mod; diamond plate, paint, fuel tank & pump replacement/mods: steering column mods, master cylinder & ABS valve assembly, ps cooler, hood latch, frame mod for AC compressor, brake flex lines, VSS, Detroit Truetrac® installation pics, power window installation
http://home.comcast.net/~qcrispin/bronco/
"... It is essentially a 2004 F-150 in a 1978 bronco body and frame with solid axles front and rear. I'm driving it daily to and from work with almost no issues. ABS is fully functional. Once the seats are installed I can start thinking about carpet which should make the project look much more complete. Please take some time to look through the site. Virtually every part of the project has been documented with pictures. I even have a selection of video clips if you don't mind downloading a 2 Mb file. Also feel free to send me an email with comments or questions if you like.
Installing a motor that was never intended to fit a '78 bronco means I have to fab my own mounting points. Here's what the original mounts look like.
I used a plasma cutter to remove the mounts so I could set the new engine in place. How well does it fit? The exhaust manifolds are barely inside the frame, so they will determine where the engine sits left to right. The brake booster diaphragm comes very close to contacting the driver's side valve cover and it looks like the steering box I sent off to have rebuilt may interfere with the steering pump. Also the lower radiator hose looks pinched between the steering pump and frame. Raising the engine would help, but the brake booster prevents it. My options are relocating the brake booster to get it out of the way, or use the booster from the '04 which may or may not operate on the same pressure.
I found the engine fit best when I pushed as far back as possible. Once I felt it was in its final resting place I tack welded the mounts to the frame and pulled the motor out leaving the mounts in place. I then finished welding the mounts with plenty of room to move.
One problem with where I put the engine was the passenger exhaust manifold pointed right at the frame. This isn't too suprising once you realize that the '04 frame is about three inches wider than the '78. Rather than experiment with aftermarket manifolds I decided to notch the frame and reenforce its exterior with some heavy square tube.
The before picture on the left shows the area of the frame that's in the way. The arrow points out the factory body mount. The picture on the right shows the completed modifications. Since I was removing the factory body mount anyway I decided to replace it with one off the '04.
With the engine placement done I can start on the firewall. Here it is all cut away!
This isn't even all of them! The engine/transmission harness is on the motor where it's supposed to be and I wasn't about to take it off for the picture. It will be interesting making all that fit on the old bronco.
With the transmission out of the way I was able to finalize work on the support piece. The original transmission support bolted directly to the radius arm brackets as well as the frame. The radius arms keep your front axle from going backwards when you hit a curb, speed bump, *** hole, you name it. I didn't feel good about removing some of their support without adding something back. Here's how I decided to do it..."
READ MUCH MORE
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2004 Hemi specifications (courtesy Cole Quinnell)
Block height,
oil pan rail to top of water outlet 15.4 inches
Overall engine length 21.1 inches
Weight (with induction, wiring, flexplate,
and exhaust manifolds, but not accessories) 485 lbs
http://www.allpar.com/mopar/new-mopar-hemi.html
vs.
5.0 – 183/4" Width
5.8 – 21" Width
5.0 oil pan to top of valve covers 20.25 inches
5.8 oil pan to top of valve covers 23.75 inches
5.0 & 5.8 Overall engine length 27.5 inches
5.8 Weight 525 lbs w/out induction, wiring, flexplate,
and exhaust manifolds, &accessories
You'll need the HEMI's PCM and wiring harness(es) engine, trans, and charging/starting - these need to be integrated to your ign switch, etc.
