Once I have a big healthy pile of money again I am going to buy a HUGE Fleetwood Brougham,

It is just going to be huge.

What motor should I jam into it for the most horsepower?
I could swear I saw claims of a Cad 500 making 700HP one time..

Also, I am worried that I won't be able to get ahold of the road with so much HP when I take off.. what can I do about that?
Also can you possibly keep a 700HP motor quiet sometimes?
(I could use a cutout for when I wanted to get on it see)

1) There is no substitute for cubic inches...except cubic money!

2)Heavy car, good tires.

3)Big exhaust with multiple large mufflers. No one made a law that you can only use 2 mufflers to a car. I've seen cars with 4 mufflers, both 4 exhaust that ended ahead of the axle, and 2 mufflers to a side. A lot of muscle cars used resonators, basically a small muffler, after the regular muffler. If you have room 2 big hiflow mufflers and 2 glasspacks in the tailpipes should work well. Also full exhaust and turned down tips makes a difference.

Glasspacks can have a restriction inside so make sure their inside diameter is full size.

500 or 472. 700 horsepower is easily obtainable, at the wheels even, if you've got the cash.

These seem to have plenty of power.

I love you guys
And that is crazy since I hate most people

Hmm. Forged pistons & rods, decent hydraulic cam, intake, headers, 300 shot. That ought to do 700hp, with like $2k into the motor. You'd need drag radials. Good ones. Wide ones.

Hmm. Forged pistons & rods, decent hydraulic cam, intake, headers, 300 shot. That ought to do 700hp, with like $2k into the motor. You'd need drag radials. Good ones. Wide ones.


Mr. Dave is a 300 shot nitrous?

Pardon me for butting in on a topic where my knowledge is sketchy, but that sounds like so much fun lol. I hear fuel injection conversions are available for such engines...either you considered that a given, or are planning on carb mods. I've heard the quadra jet has pretty good potential.

That also might keep you from getting 1 MPG after all this lol. Don't forget the obvious like routing the air intake away from the exhaust and such.

I don't think you'll have trouble holding down a huge Brougham... Those engines are steel block I think...that's going to add some weight for you right there. Make sure you get a kick-arse suspension in there... It will ride like a cruise liner :bouncy:, and help general handling as well. Good example is I could use new shocks, and when I take a sharp turn, it sways and I can feel it slip just a wee bit...and I have a "normal" car lol.

I trust this will be rear-wheel drive...so if you take off in something like that, then you're probably going to be steering the thing back onto the road lol... Someone who knows more than me please tell him how to fix that :rolleyes:....unless it's at all simple to adapt a Northstar computer system w/ the traction control to such an engine. By the way, if you finish it, we want pictures!

It will be after I turn a couple properties over
I just know a guy could build these up and sell them for a big fine profit because the avg guy lookin at doing that knows it can be alot of work and expense and most don't want to tackle it

But once you're sure what works and how it is done you could do it all of the time

Maximum Torque Specialties (www.500cid.com (http://www.500cid.com)) sells some good performance rebuild kits for these engines. It'll be in the neighborhood of $1300 though. I don't think the pistons they come with are available in standard bore, but any machine shop will can do that for a pretty good price. You'll also want to get a roller rocker setup while you're at it, the tech guide for the engine does not recommend using the stock rockers if you'll be running the engine above 4500 RPM. If you end up with a '74-'76 500, you'll want to order two 76cc heads (unless you have a supercharger). MTS sells them used for $100/ea. They'll need to go to the machine shop, but he guarantees they won't be warped, cracked, or otherwise completely worthless.

I hear fuel injection (http://www.cadillacforums.com/forums/#) conversions are available for such engines
I haven't looked too far into it, but there is some good FI stuff out there. There is a Bulldog performance intake for the 500 that has flat surfaces you can drill for injectors, and there's an aftermarket control system called Megasquirt you could use. A factory FI system was available as well, but it wouldn't be worth a whole lot with mods. If you stay with a carb, you're going to need a lot of fuel flow (at least 900 CFM). I'd look at Demons, they make double-pumpers with 1000 CFM or more. A Q-Jet wouldn't be my first choice. I've heard that mechanical secondaries aren't good for high performance.

When you're done, it will pull very hard to the side when you start out. That's pretty unavoidable considering you'll be putting out tons of torque right off the line. Adapting a traction control system would be a royal pain in the ass, and frame and suspension mods will only help to a certain point (at the expense of ride quality). I'd just take the car someplace where you can't accidentally hit something and have lots of room, and spend as much time as you need getting used to it.

If this is something you want to do in the near future, I'd start planning every bit of it first chance you get. It's a great idea for a project, and the car will be a lot of fun when it's finished.

- Joe

If you have a 74-76 engine, that doesn't mean that you have to get 76 cc heads. The 120cc heads with cheap KB flat tops will give you 9:1 cr, more if you deck the heads, etc. No use buying heads for 10:1 comp.

If you go with EFI, I would look for a stock fi manifold and port it/work with that. The Bulldog will be wayy too much intake for your engine, so you will end up having to buy it (not made anymore) and then paying someone to fill it with epoxy (potter) and shape it to work with less of an engine than it was made for.

You don't need a 950-1000 cfm carb either. A good 750, 800, or 850 Edelbrock, Qaudrajet, or whatever would be fine. JET performance can custom build a Quadrajet to match your engine combo. The Quadrajet is the best street performance carb, imho. When tuned right they are unbeatable with great performance and the best mpg that you can get with a carb. They are harder to tune than a Holley, but it's not a big deal once you understand them. That's why most people bash on them, because they don't know how to tune them. Doug Roe's book on Quadrajet carbs is a big help when dealing with them.

Yes, 300 shot of nitrous. That will get anything moving, and what I posted would probably the quickest and cheapest way to 700hp at the crank.

The bulldog with FI would be good on any engine. People say it's "too big for a street motor" because it doesn't give a good vacuum signal to the carb on a mild motor. It would be fine with FI.

Didn't the 500s come with 800 CFM carbs from the factory? FredMaxwell is talking about doubling the output of his engine, and if he goes with a new valvetrain and performance cam, he'll raise his power band and give the engine a better high end than it had before. I don't have a problem with Quadrajets, but I don't think they're the best choice in this case unless you can up the flow rate and make it work better at higher RPMs (a stage 2 or 3 JET would probably do that pretty well).

- Joe

From what I've seen the Quadrajet is king until you're in the 500hp n/a range. A QJet should flow enough for a 500 at 5500rpm at 100%VE, which you're not gonna see. And yes BBCads got the 800/795cfm version.

Yes, All 472/500/425 came with a 800 (795) CFM Qudra-Jet.

I personally really like the Q-jet... and as Dave said... until you are getting to 500hp+, a stock Q-jet will do anything and more you ask from it.

I will be so calm once I can afford a built Fleetwood!

Wouldn't 700 horsepower be kind of going overboard? I can see 500 or 550 hp, but with 700 hp, the car wouldn't be anywhere as streetable/tractable as a stock 472 or 500.
To get that much hp, you would almost certainly have to install a hi-po, hi-lift cam which would result in a rough idle.

That's where the spray comes in. Figure a mild 400hp street motor with simple bolt ons and cam (noticible idle but nothing too wild) then 300 extra ponies with the flip of a switch (and of course the forged internals to take the abuse.)

I do not mind a rough idle.
It is OK for the car to rumble and jump around and be louder at idle
than most cars would be at WOT :)

I do not want to be able to start off without peeling out

New to the sene here is a pic of my KNFUZD51 its an 1951 merc sitting on a olds delta 88 frame, with a cammed 472.

Fred if you don't mind a rough idle then you've got plenty of headroom... wait until Potters aluminum heads are done or do fully ported 76ccs with a real strong solid cam for 6600-6800rpm.

New to the sene here is a pic of my KNFUZD51 its an 1951 merc sitting on a olds delta 88 frame, with a cammed 472.

That looks like a pretty sweet project :thumbsup:

You're making me want more money
Because I want a built Fleetwood
*sigh*

Wouldn't 700 horsepower be kind of going overboard? I can see 500 or 550 hp, but with 700 hp, the car wouldn't be anywhere as streetable/tractable as a stock 472 or 500.
To get that much hp, you would almost certainly have to install a hi-po, hi-lift cam which would result in a rough idle.

A stroker aluminum headed 10.5 -1 cadillac making 700 horse does not need to be loud or have a 1500 rpm idle.

I have a couple:thumbsup:

TI

A stroker aluminum headed 10.5 -1 cadillac making 700 horse does not need to be loud or have a 1500 rpm idle.

I have a couple:thumbsup:

TI



wow:bouncy:

Hi all,

iam new to this forum and i live across the pound in holland, europe.
after reading a couple of articles about the bigcads mass torque i was directly interested for one of my street/strip project.
project car : olds 442 1970
already ran 12.57 with a 455 cubic olds without power adder.
suspension all stock.
now i bought me a 472 from 1969 with following numbers and codes:
block 1486238
heads 1486250 (smog rail???)

now my plan is to stroke this 472 (540???). If i want to go this route...this combo must be able to push me into high elevens or mid elevens..

i will change my rearend to a 9 inch and maybe bit narrowed. Olds 442 is a beauty to see. But i want to ran this beauty into 11 with the proper mods on chassis and technique.
I have a 10 inch TCI converter (3000 stall)
TCI Superstreetfighter TH 400
9 inch will be a 3.08 or 3.42 posi...mileage and streetable...

And after good couple of runs and everything holding up, a Procharger to boost more Torque to my GM A body into fast ets......

Budget???

MUST RUN ON PUMPGAS ...................................

Any help is appreciated!!!


Thanks....

So FredMaxwell iam with you......