Classic Mustangs (Tech)Technical discussions about the Mustangs of yester-year.
Welcome to Mustang Forums!
Welcome to Mustang Forums.
You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!
I'm looking to resto-mod my 1967 Mustang. I'm going to the the typical things (4 wheel disc brakes, Overdrive transmission, Rack and pinion steering, etc...), but I want to drop in a 4.6L engine from a 1996 to 2004 Mustang coupled with a six speed manual transmission (converted from an automatic). I want the motor to have all ODB II capabilities, including a DLC to help diagnose any problems it develops. I am also planing on running cats to use the downstream O2s (but cats only, no mufflers). I am wondering if anyone knows if any of this has ever been performed, and if any modifications have to be made to the car, engine, wiring, or computer to make this work.
This ad is not displayed to registered or logged-in members. Register your free account today and become a member on Mustang Forums!
Not ALL 4.6 engines are that big, only the DOHC engines. The regular 4.6 engines in late model Mustang GTs and F150s are about the same size as a regular 302 or 289. If you are going to go with the 4.6L DOHC such as those found in the Mustang Cobra and the Mach I (I believe), then major engine compartment fabrication is going to be needed, such as losing the shock towers.
I don't know what the distance from the bottom of the shock towers are on a 67, but on my 65 it is only 24 ". However, on my 03 Mach1 with a 4.6 DOHC, the distance is 10 inches further apart at 34 ". You may have a few more inches to play with over my 65, but certainly not 10. Wasn't it the SN65 that they crammed a 4.6L in? I don't remember all the details, but no doubt they altered the engine bay drastically to get that big sucker in there.
Just because one has DOHC and the other is a SOCH doesnt mean that one is vastly smaller. Modular means parts interchange easily. that means take a 2V block and add 4V heads and you have a poor mans 4V with the same displacement. A 289/302 is tiny. I can almost lift the entire engine by myself, no lie. We have pulled them out of Mustangs by hand, just grab the exhuast manifolds and yank.
A 4.6L is wider than the BOSS 429 in DOHC configuration, and even wider than a 460 in SOHC form. Then they are taller as well and a tad longer than the FE and W/C engines. Fiting one in a 67-70 is going to be a tight fit, much like dropping in a 460. Nothing will bolt up, not one single thing. it must all be fabricated or bought in a kit to do it.
I figure that if I would be going for the expense and time involved with a 4.6L swap, why not do a 5.4L instead? Go for the inches, put the Cobra top end on it and you now have a poor mans GT engine. Just dont turn up the boost too much. Still around 450 net HP would make a 67 Stang haul tail real well. its just gonna be expensive getting there.
Tools to buy.
A quality Welder, not a cheap little 110V flux welder, you need a good one.
A level floor because you will have to reassemble the entire car with the new valve train and getting the front wheels on in the right place isnt a slap it in there type thing.
A sawzall or simliar tool, because there wont be much left of the front end and floor pan of the 67, its a fast way to get it gone.
precision measuring devices, because you want the car to go straight down the road, not dog tracking..
If you want to go that route, hope you have deep pockets, and the SN65 was a Cobra that had the body removed leaving just the floorpan and drivetrain, and a 65 body dropped over it. not something you can do in the driveway or apartment complex parking lot. that takes ROOM, lots of ROOM to do it. My shop is 50x50 and a disassembled 71 fastback takes up MOST of it.. I can only get one other car in there to work on it with all the parts and tools required for a major restoration or job such as that would require.
Or you can just buy the stuff, and listen to the guys who say its the same size as a 289 and try to make it fit. Good luck with it..
They do run well though..
Alternatively, look into a 5.0L swap with the EFI and everything else. much simpler, cheaper, and wont take up more room than I have.
This forum is owned and operated by Internet Brands, Inc., a Delaware
corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford
Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor