500 Cadillac- PICs

[Super Chevy]

Im planning on buying a 500CI cadillac for my 72. I have been wanting to do this since November 2001. I have finally looked up some info on these motors, I have decided to go with a 1970 eldorado model because of the power figures. What i need to know is What year/model oil pan/pickup will i need, i know ill need a remote mount oil filter. I plan on buying a TH400 trans for this beast. What motor mounts will i use? SBC work? And will the stock exhaust manifolds work?

Below is a picture of what power figures ive found

[Longhorn Man]

First...the links;
Not too much help.... http://www.geocities.com/bigblockman...hevrollac.html

Good reading...he won't respond to e-mail...
http://www.500cid.com/mts/Rides/wayneb/index.html

Real good info burried in there...look over the whole site....
http://www.cad500parts.com/
And almost worthless
http://500cid.com/index4.htm

'70 is not the strongest...'71 is the exact smae motor, just net instead of gross... Either one should have 10:1 compression, so if you give it any amount of advance on the timiong, you'll need 92 octain AND a bottle of 104.
The oil pans came in 3 styles... front sump, mid sump and rear sump, the rear is what you want, and the most popular is the Eldorado's rear sump. Be sure to get teh pump pick up with the pan...place it aprox 1/2 inch from pan floor.
Remote filter, not absolutly needed, but very good idea.
The TH400 is said to be the only one to hold up...I'm crossing my fingers and putting the 400 verter in my Pontiac TH350. If it scatters all over the freeway, I'll still have the 400 to slap in, I just don't wanna cut my shaft down yet....$100 in these parts.
As far as mounts..I haven't gotten this far yet.
Exhaust manifolds...You'l want rear wheel drive manifolds....NON eldorado. Headers are kinda doable too. You'll need big block headers for your chassis, then get the $70 kit (in the catalog you need to print in one of the above links) and weld them on.
As far as Intakes, there was the alluminum single plane that was on the 368, but id has small ports. THe 425 has a cast single plane, with better ports, and then there is the 472/500 cast intakes, both being daul plane. Eldebrock has one 10 X better than ANY of the stock ones for about $250.
From the one truck i seen in person, there may or may not need to be some cutting on your frame. (the one I saw had sme) they cut notches for the stock shifter rod, the exhaust, and the oil filter.
This is all I can remember off the top of my head.

[68 Suburban]

http://cgi.ebay.com/ebaymotors/ws/eB...tem=1846427030

[crazy longhorn]

I ran a 425 in the longhorn for a while,& pulled the complete runnin eng from a 78 sedan deville. for eng mounts, I used the eng brackets & clamshells that came with the cad. These were mounted on a 73 up pu stand,with a pc of 3/8 flatstock welded on top to extend the mounting point ahead(cad eng mounts are farther foward,& wont sit on the stands). I opted to slide the engine back, & did my carving & welding on the firewall(the prob area will be the LH head to firewall). For rad hoses, I used the stock sed deville top, & a 73 up sb pu lower,That was flipped from end to end(large dia straight neck on the rad). I agree with Longhorn on the comp ratio,you dont need ,or want 10-1 comp on pump fuel,a low comp cad will pull like crazy,& be very reliable. there is a shot of the cad in my longhorn pics, but not too much on detail. good luck.....Al http://community.webshots.com/user/hotrodhorn

[Longhorn Man]

how to ID the big block engines...
http://www.geocities.com/MotorCity/P.../Engineid.html

[Super Chevy]

I didnt expect so many responces so fast, thanks guys for the infomation,ill probably print this page out for referance...

[Pumkin Truck]

I don't mean to bust your bubble Super but, I heard on the message board at (500cid.com) that the 70 500cid hp was not real, and all of the motors made around 210 hp. But, they really did have all that torque.
One question i have considering this swap, i am going to put the t400 in my truck, we wouldn't have to cut the cab floor up would we? And what about the radiator, what would i have to do to my six radiator to keep it cool? besides get a bigger one?

[Longhorn Man]

A 3 core in good shape should do it from what I've found.
And the 500 ft pounds...it's true, BUT, that is the old rating. They dropped overnight when the raters chainged the way they rate power.

[Super Chevy]

that rating is just motor at the flywheel,NO acesserys,no fan,no A.I.R pump and most likly on 104 octane. i know that i wont have 400hp with all my acesserys,itll be 365hp at the flywheel with acesserys like the 71' model and itll have about 300-310 at the wheel is my estimate being the th400 takes what i hear 20%power away...

If im wrong on any of this,anyone feel free to correct me

[Longhorn Man]

I think this is common knowledge, but the caddy takes a B.O.P. bellhousing...not the typical Chevy one. The actual caddy TH400 has a tail shaft that is a mile long...I would think you should be able to go to a one piece shaft...even on a long bed possably.

[Super Chevy]

I was hoping and planning on using a one piece drive shaft with this BOP trans,i wanted to get that ultra long 9" one so making a driveshaft selection would be easier.

[larouchedem]

Super Chevy,

Don't pay any attention to the factory ratings.
All the '68-'73 head flow about the same, as do all '74-'76 heads. The compression ratio is the major difference. '70 was gross rating. '71 up
was net.

Fyi - the '70 500 is 10-1 CR, and will not
like pump gas unless you use a big cam. The
'68-'70 472 are 10.5-1. All '71 up 472s and
500s are typical low CR [8.5-1 or less]

The 68-73 472 and 500s have 76cc heads. '74
472 and '74-'76 500s have 120cc heads. There
are several ways to tailor CR to your needs,
including using 96cc 425 caddy heads. Fyi -
KB makes a flat piston and a 28.5cc dished 500 piston that will allow various CRs too.

While the '68-'77 fwd rear sump pan works for
2wd truck, so will the rwd 368/425 pan.

Any b/o/p trans bolts to the 472/500, although
as on other poster said, some [not all] of the caddy TH400s are an odd extra long tail.

You can use the stock caddy engine mounts and
fashion brackets to go to the frame. Just hang
the engine/trans on the trans crossmember,
center caddy fan in your shroud and fashion what ever you need to make it work.

I've done 500 installs on several trucks and
I've never needed to use a remote filter.
Dave
'72 C-20 w/a $100 '76 500 caddy. Ran 14.67@92
on 7.50x16 winter tires
'67 prostreet style pu project -twin turbo'd
511" caddy





[/i]
Im planning on buying a 500CI cadillac for my 72. I have been wanting to do this since November 2001. I have finally looked up some info on these motors, I have decided to go with a 1970 eldorado model because of the power figures. What i need to know is What year/model oil pan/pickup will i need, i know ill need a remote mount oil filter. I plan on buying a TH400 trans for this beast. What motor mounts will i use? SBC work? And will the stock exhaust manifolds work?

Below is a picture of what power figures ive found [/QUOTE]

[Purs]

Super,

I know less than nothing about this subject, but a former student of mine made this swap in his 69 SWB and I noticed that he had notched the top part of the frame so he could fit his headers in. Just FYI.

[vfrdude]

I would think with all the modifications that have to be made, to make this motor fit, that a big block chevy motor would be the way to go. There would be a lot more in the way of aftermarket stuff for the motor also....

[brennecke]

True, but the caddy weight a lot less and comes with an extra 50 cubes. Plus they are nearly free if you find them at the right places.

[larouchedem]

vfrdude [/i],

What you say is quite true, but too bad you can't buy good running 454 chevies for 200-300 bucks. If both are in a mild state of tune [near stock, w/low CR], the caddy will run as well as, or better than a 454 in a heavy truck. With extreme power goals in mind, I'd say the chevy is a much better choice.

The caddy swap isn't for those just like to take parts out of the box and bolt them on, but for dyi guys that aren't afraiod of the extra labor, the cad is a cheap way to get tire shredding torque..

Not arguing w/you, just giving my 2 cents.
Dave



I would think with all the modifications that have to be made, to make this motor fit, that a big block chevy motor would be the way to go. There would be a lot more in the way of aftermarket stuff for the motor also.... [/QUOTE]

[vfrdude]

I figured it would be a major cost savings... I've always toyed with the idea of putting a BBC in my truck, but the cost is a major hurdle for me at this time.... Maybe someday (sigh, as I stare into the distance)

[Longhorn Man]

Modifications???
Look in my Caddy swap page in my signiture...about all i have had to do is trim the mnotor mount towers, hammer on the firewall, and tap on the frame.
Don't seem too hard to me.

[6772king]

I wouldn't use a oil filter relocater. did it once to one of the 500 swap's i did and had to replace the bearing's 6 month's later, i dont now if anyone else had this problem or if i just did something wrong i just cut the front crossmember and i also had to cut the pass side frame rail buy the manifold. mooneyes4b has a pic of the mount's I made and i have a template if you need them made ask him for the pic.

[6772king]

this is some of the pics i have

[6772king]

check out these emblems

[6772king]

better pic

[mooneyes]

pics of 6772kings 500 cad

[mooneyes]

mounts

[Longhorn Man]

Also the 425 has a oil pump with a better angle. I have mine in there and don't need any additional room for the filter...it's all good.
Now...My main question now....

How the h*ll did you do this? (and what would you charge for a couple that said 425?