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Old 05-13-2013, 08:54 PM   #1
DaveyG
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Join Date: May 2013
Posts: 11
Default My Fat Fordillac (The Fattylac)

Hi all! I figured I'd introduce myself and throw up a few pics of my truck. First a bit about myself, I'm 25, married, with 2 kids, ages 1.5 and 3. I'm a maintenance machinist with a small food/supplement packaging company, as well as in the middle of starting my own small machining business, when my landlord said we had to move, and I had a handful of non-running junk motorcycles I traded for this running, driving, Fattylac! I had a few truck trade offers, but I picked this one for 2 reasons, it was the only big ol beast with enough seats for my whole family, and IT'S CADDY BIG BLOCK POWERED!!!
I'm not a big Ford fan, but if they've got GM powerplants in them, then they're bound to run pretty darn good! Now first off, I was just told that it's a 472 (which I can tell by visual inspection it's definitely a Caddy Big Block) but is there a definitive way I can confirm the displacement? Like where should I look for the casting numbers, and if I post them can someone differentiate them for me? Thanks! Now for some pics!




Short term plan is to just use it for moving, and then I'm going to try and hunt down a 3.07:1 Dana 60 diff (or a 3.55 if i can't find a 3.07) to replace the 4.10:1 Dana rear to try and squeeze a few more mpgs out of her. Then I might yank the 472 and put a plain old smaller Ferd motor and trans, and pass the Cad motor back on to a more rod-like project. (That's the 5 year plan)
Let me know what y'all think.
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Old 05-13-2013, 08:55 PM   #2
DaveyG
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To keep with the 4 IMG limit here's the rest I have currently.
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Old 05-24-2013, 07:25 PM   #3
DaveyG
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Any tips on tweaking my quadrajet? It idles and runs like a top if you stay out of the secondaries, it accelerates, but feels like it's not breathing enough, like maybe the choke is staying shut on the secondary side? Anybody else experience something similar? There are some cooked wires under the hood, one going to the temperature sender, one to the back of the block, and one to the passenger side near the carb? Could that be part of the issue? Thanks!
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Old 05-26-2013, 07:46 AM   #4
DaveyG
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Well I had a little time yesterday, so with the help of my father-in-law I started learning about what he called "the quadratoilet" and got her running awesome! The stutter at full throttle was from a missing vac line for the advance, then with a touch of adjusting the a/f mixture, she propels this big ol' turd of a truck out of her own way pretty well!
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Old 06-16-2013, 09:52 AM   #5
Caddylackn
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Join Date: Oct 2009
Location: Bremerton WA
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A missing vacuum line would do it, plus you are not getting the correct timing at part throttle with no vacuum line to the distrib.

The quadrajet is a good carb, but is very vacuum sensitive.

I am interested in what you get for mileage? That truck stock with a 460 probably only got 8-10 mpg new and maybe 6-8 mpg towing. They probably yanked the 460 out to put something that would get a lot better mileage towing. If you are not going to tow or haul anything heavy, a 9" rear end with 3.08 from a F-100, F-150, Bronco is not hard to find and will save some weight. You could probably trade straight across for someone who is wanting to upgrade their bronco or 4 x 4 and needs the stouter rear end to run big tires.

A good replacement Ford motor for the truck after the CAD motor gets a good home would be a 400M, with a good after market cam, or a 390 maybe with a 4 speed manual. I see those all the time on craigslist in the $400 range. I would stay away from small blocks, as you will not really see anything over 12 mpg even with a ford small block, as that is a heavy rig and you need the torque of a big block. A 390 is a good compromise between torque and gas mileage. If you are getting 12 mpg now, I don't think you will be able to get much better than that with a ford motor unless you want to spend alot. The best way to mpg would be a 6.9 or 7.3 diesel swap. You'd be better off just buying an old diesel truck to start with.

To please the wife, go to the junkyard and replace those ugly seats. You need to sort out and separate those spark plug wires with a wire loom to prevent cross fire. A CAD HEI distrib. will bolt right in and make a good upgrade for power and mileage and is easy to find at the junkyard, any cad after 1974 should have one. Grab a tail light too, while you are there. That motor swap looks almost factory, it would take a trained eye to spot the difference.
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Old 06-18-2013, 09:54 AM   #6
~JM~
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Join Date: May 2005
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About the only way to determine if it is a 472 or a 500 is to measure the stroke. You can pull a sparkplug & insert a wire at TDC & mark the wire, then rotate to BDC & do the same. I think it should be about 4" for a 472 & a hair past 4.25" for the 500.

Either way... You have a cool truck with a great engine & most likely the most fuel efficient big block ever manufactured. Some 3.08 gears, an HEI & a well tuned Q-Jet, will deliver some decent fuel mileage for what you have. Remember that it is a big ole brick of a truck. Both heavy & not very aerodynamic.

Good luck
~JM~
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