Fuel Injected 500 cadillac? Anyone know about these

I have a 472 cadillac that I am considering fuel injection for. Any one know anything about them? Where I could fine a factory intake? Injectors? Distributors? I have never seen one up close and would like some pics. Thanks.

 

GM did have FI on the last of the Eldo's, but I've not heard anything them. It's a TBI system, not injection, and you'd need to get ALL the factory stuff to use with it. What's wrong with an Edlebrock manifold and 750 E'carb? I'm running the stock iron manifold on my 472, to clear the hood, and the Quadrajet, and am very happy with the way it performs.

Lots of stand alone TBI systems now, but they're pricey and I wonder just how much improvement you'll see for the expense.

Brian

 

I've never seen one either but have read about them. They were only offered a couple of years and were analog not digital. The guys on the Cadillac forums don't seem to think they are worth using unless you're restoring an injected 500 powered car. They are temperamental at best.

 

I have the quadrajet and the original manifold. I am planning on running that for starters. Atleast until I can afford an aluminum intake. I was just thinking of using the fuelies for the reliability factor. I was told that they had independant injectors and a throttle body, but as I have said, I have never seen one. What kind of mileage and power do you get with your quadrajet? I am planning on making it my daily driver. It's going in a 55 buick 2 door hardtop special. I also have the 400 turbo too and a 3:42 big ten rear end. I have subframed the car with a caprice police car and am using the rearend set up as well. We grafted the rear section into the frame. It's killer. The fuel injection was just an idea. I don't think I would go with it, but I thought I would ask. This is an awesome place for answers and such so I knew I could get help here. Thanks for your help guys. Any more advice please let me know.

 

Frpm what I have seen and read, if you ditch the cast manifold for the Edelbrock 2115?, even using the Q-jet you'll gain 15 lbs and 12 or 13 horse over the cast intake. I've got it for my 472 but still haven't found the next project to drop it in

 

Would you want to get rid of that intake or are you planning on using it?

 

Supposedly, according to the guys at MTS, the way my 472 is built it should be 400hp. The E-manifold is worth a little more, as above. It starts at the touch of the key, makes STUPID power from idle on up. Nice lumpy idle with the Erson cam, although I'm not happy with the way the lifters rattle...

 

I know that it really is impossible to get good mileage, but what kind of mileage do you get with yours? Any idea? Like I said, I am planning on using this car as my daily driver. My avatar is what I want it to look like.

 

The taller the gear the better off you'll be. The older 472s were rated at 525lbs of torque stock and 540 with the Edlebrock intake so pretty much no matter what gear you have it'll smoke the tires. Also they do not like higher rpms. Commonly they shift at about 4k and that's about all you want it to do. Any higher than that in stock form you run the risk of valve train damage because they weren't built to do any more than that because of all the power down low. It will be almost impossible to get good mpg but go as tall a gear as you can.

 

Will a 700r4 hold up behind it?

 

700r4 would be a great choice BUT it would probably have to be built to take that much power. If you were only going to drive the car and not rod it, chances are it would be ok at least for a while. I don't think the 700 will be a good choice compared to the T-400 for strength. If your 472 is a smog engine the hp and torque numbers do drop but only about 15 per cent . That said the 700r would live longer

 

Mine is a 71 non smog. I have a 700 that is the only reason i bring it up. Got a buddy that has a 454 with a 200r4 behind it. It was built pretty good though and he says it works fine. I was only looking at the overdrive for the gearing and gas mileage. But, as for rodding it, of course I would give it a hit ever once in a while. I mean an engine like that, I ain't that old yet.

 

sure you can inject a 472 pretty easy actually ...

why use a 700r4 .. just go for the 4l60e version ... go 95 and newer 93 was trash it used a non pwm converter

get an ecm from a 95 350 truck ....you will need some bbc injectors ...

 

Ok, now you got me thinking. What all would that involve? Isn't the trucks with the 4l60s throttle body style injection? how do you solve the distributor problem?

 

with the 700r being basically chevy, it will bolt up with the exception of the top center bolt. The Caddy uses a valley pan that chevy didn't so you'd have the top center of the trans sticking up in the air right? I think there are adopters for that swap but can't remember where. In any case you'd want the trans to be built to hold the Caddy. 545 lbs is more than any stock BBC engine made

 

I think I will stick with the 400th since I know it works. But, it's always good to dream. And, the money I would spend on all that other junk wouldn't really help the mileage as much any way. I know it's a stump puller. Are 2:73s out of a 70 chevelle the same as the big ten they put in the caprice police cars? I think they are but just checking. I have a set of them too that I could swap out. Do you think with that combo, 472, 400th, and 2:73s i might be able to get around 15mpg?

 

the factory injected system on the 500 inch engine is the same basic system as used on the 350s in the seville. i worked on a few back in the day. the are pretty crude compared to what is available today. they do have 8 indivdual injectors, you could use the manifold and an after market computer.

 

CadZZilla ran FI for, like, 10 minutes. Didn't work for crap. Single four makes it roar.

 

That's what I thought too. Oh well. I guess the carb is the best way to go.

 

I bet a factory Chevy big-block TBI setup would be a snap to adapt to a Cad. Especially if you aren't afraid to have the chip in the ECM reprogrammed. (none of the last versions of the big Cad motor came stock with a TBI intake? I'd have to get my book out to see how long it lasted or if the deck height changed or anything.)

 

I was told the 368 tbi intake would fit the 472. Not sure about the distributor thing though.

 

Maybe. I've spent a fair amount of time on several Cadillac forums researching these motors and what I read there suggests the kind of combination you've just proposed will give great performance because of the low speed torque from the 472 and since it won't ever ask the motor to turn very fast your mileage will be better than with deeper gears.

But since your right foot has a lot to do with determining fuel economy I'm not going to be the one that says yes it will.

There are guys claiming to do that and maybe a little better with a Cadillac 500 in a big car.

I'm building a 1-ton pickup using a Cadillac 500. Building as in its not done and I don't yet really know how its going to do. My combination is the 500, TH400 and a GM 14-bolt with 3.42 gears. My goal is to pull a trailer with finesse. I think those gears are going to work well for me but would be far too deep for a car that isn't raced or used to pull a heavy trailer.

 

So, you guys think 3:42's are too much? Maybe, the 2:73's are better?

 

One last thought, if your still forging ahead, a company named FAST makes a set up for you car but you will need to find the right distrubuter for it, which I haven't yet. Without the dist, you can only run bank to bank injection, but it still is a monster. I drilled out the manfold for it and installed the FAST injectors and rail. Be advised! You will spend a lot of time on the computer to learn the system. Use one of the FAST templates to get started and change thinks slowly.

 

Check your bell housing bolt patern. The cad is different than the chev. I had to use a cad 400 not a chev 400 or 700. Ttoy

 

find a 80's 368 (?) and grab everything, it's throttle body.

 

FAST injection will put you in the poor house, great system but they are pricey.

Adapting an 8.1 or 5.7 tbi out of a GM truck 90's would get you there. they still ran distributors.

4L60E is a pricey trans, especially to build up. 700R4 is a little better but you'll still be over $1000 to build one for that torque level unless you can build it yourself

Big Caddy's are torque monsters not high RPM, dont need a lot of gear. 3.20 - 3.30's should be a good all around gear.

You dont say what car (weight) this is going in and what your plans are. weekend street / strip, or highway cruiser

 

Why is reliability a reason for you to go with EFI over a carburetor.

If you lose a fuel pump with a carb, you can just gravity-feed it to get you home. Try that with EFI.

Same with the distributor, you can limp points home. If the HEI module lets go, you're on a truck going home.

Carbs and points are very, very reliable and can get you home even when the system isn't running 100%

 

A friend of mine has a merc convertible with a .030 500inch Cadillac, 700r4, 2.73:1 with 2 afb's. when he goes to the turkey run he gets 25+ mpg at about 90 MPH.

 

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