Longhorn Man - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*Randy70C-10* · 12-09-2003, 11:34 AM

Hey Andy, I have a question. I need to get a distributor for a 1970 Cadillac but I'm not sure what engine is in it. It's a big engine, are the distributors the same? (BTW, it's a DeVille)

1969 GMC · 12-09-2003, 02:57 PM

hey Randy...maybe I can help. That should be a 472 in the Caddy. the 500 was only in the Eldo that year. Hope this helps.

*Randy70C-10* · 12-09-2003, 03:05 PM

Yeah, I found out that they were all 472's . I want to do an HEI conversion, does anyone make an HEI distributor for these?

lukecp · 12-09-2003, 03:11 PM

Later models came with HEI.....not sure if a 500 dizzy will work in a 472 though

*Randy70C-10* · 12-09-2003, 03:48 PM

K, I just found out that the part number for a distributor for a 472 and a 500 are the same. Does anyone know what year they started putting the HEI in Caddys? Also, does the Caddy HEI use an external coil or is it built into the cap?

tom hand · 12-09-2003, 04:02 PM

HEI's started in 75 in everything GM as standard....was optional in 74 on some models

*Randy70C-10* · 12-09-2003, 04:23 PM

What about Caddys? Looks like they stopped building the 472's and 500's in 71, is that right? Did 425's come with HEI? If so, will they swap into a 472? I'm stumped on this one. I've been messing with Chevys for 25 years, Chevy is all I know.

1969 GMC · 12-09-2003, 04:46 PM

they did not stop making the 500 in '71...I know they made it til at least '76, which was the year it got EFI...but not sure about the 472.

*Randy70C-10* · 12-09-2003, 05:02 PM

Yep, just got this from a block identification website: The Cadillac 500 and 472 engines were made from 1968 till 1976 (today has been a learning experience)

lux hauler · 12-09-2003, 05:44 PM

Randy,
The 472 was made from '68-'74. The 500 was made from '70-'76.
I believe HEI's were standard on all Caddys from '74 up. The only difference between the the 472 and the 500 was the crank and pistons.....blocks were all the same (except '68 & '69 472's had slightly smaller oil passages).
Are you looking for something aftermarket for a dizzy?.........performance? MSD makes a Pro-Billet (?) distributor for the big Cad.

dinnut · 12-09-2003, 06:14 PM

my grandfather has 2 twin 78 eldorado one with 300 miles and one with 4000 that hes been storing since new. they have 425's. dont know about hei. ill have to look sometime

Longhorn Man · 12-09-2003, 07:07 PM

You can stab the HEI directly in there, but be carefull on which way you point it, the belts will rub on it onless you put it in a certian position. (even then it'll be close.
If it is too close for your liking, you can get all the pullies off an HEI equipped 425/472/500.

*Randy70C-10* · 12-09-2003, 07:10 PM

Cool, thanks guys!

lux hauler · 12-09-2003, 07:15 PM

Quote:

Originally posted by Longhorn Man
You can stab the HEI directly in there, but be carefull on which way you point it, the belts will rub on it onless you put it in a certian position. (even then it'll be close.
If it is too close for your liking, you can get all the pullies off an HEI equipped 425/472/500.

Correct me if I'm wrong but, if the pulleys are going on a car with an A.I.R. pump, the "new" pulleys would have to be from an A.I.R. equipped car also, right?

Longhorn Man · 12-10-2003, 12:57 AM

Honestly, I have never considered an AIR pump to be reinstalled on anything I own, so I could not tell you.
Actually, I have never noticed a smog pump on one of these big blocks...I'm sure they installed some, but i have never seen one.

12-09-2003, 11:34 AM	#1
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Longhorn Man Hey Andy, I have a question. I need to get a distributor for a 1970 Cadillac but I'm not sure what engine is in it. It's a big engine, are the distributors the same? (BTW, it's a DeVille) Last edited by Randy70C-10; 12-09-2003 at 11:46 AM.

12-09-2003, 02:57 PM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	hey Randy...maybe I can help. That should be a 472 in the Caddy. the 500 was only in the Eldo that year. Hope this helps. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

12-09-2003, 03:11 PM	#4
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Later models came with HEI.....not sure if a 500 dizzy will work in a 472 though __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

12-09-2003, 03:48 PM	#5
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	K, I just found out that the part number for a distributor for a 472 and a 500 are the same. Does anyone know what year they started putting the HEI in Caddys? Also, does the Caddy HEI use an external coil or is it built into the cap? Last edited by Randy70C-10; 12-09-2003 at 03:50 PM.

12-09-2003, 04:02 PM	#6
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	HEI's started in 75 in everything GM as standard....was optional in 74 on some models __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

12-09-2003, 03:05 PM	#3
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Yeah, I found out that they were all 472's . I want to do an HEI conversion, does anyone make an HEI distributor for these?

12-09-2003, 04:23 PM	#7
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	What about Caddys? Looks like they stopped building the 472's and 500's in 71, is that right? Did 425's come with HEI? If so, will they swap into a 472? I'm stumped on this one. I've been messing with Chevys for 25 years, Chevy is all I know.

12-09-2003, 04:46 PM	#8
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	they did not stop making the 500 in '71...I know they made it til at least '76, which was the year it got EFI...but not sure about the 472. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

12-09-2003, 05:02 PM	#9
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Yep, just got this from a block identification website: The Cadillac 500 and 472 engines were made from 1968 till 1976 (today has been a learning experience)

12-09-2003, 05:44 PM	#10
lux hauler Psycho-billy Member Join Date: Jul 2001 Location: about 40 miles west of Cleveland, Ohio Posts: 2,591	Randy, The 472 was made from '68-'74. The 500 was made from '70-'76. I believe HEI's were standard on all Caddys from '74 up. The only difference between the the 472 and the 500 was the crank and pistons.....blocks were all the same (except '68 & '69 472's had slightly smaller oil passages). Are you looking for something aftermarket for a dizzy?.........performance? MSD makes a Pro-Billet (?) distributor for the big Cad. __________________ '72 C-10 350 w/Lunati Voodoo cam (207/213, .437/.454), Performer intake, 625 Road Demon Jr. and Hooker headers. Support your community, support yourself. Buy local, buy American (or Canadian).

12-09-2003, 06:14 PM	#11
dinnut Registered User Join Date: Apr 2003 Location: missouri city, tx Posts: 4,486	my grandfather has 2 twin 78 eldorado one with 300 miles and one with 4000 that hes been storing since new. they have 425's. dont know about hei. ill have to look sometime __________________ 70 longbed 496/th400/Ford 9"

12-09-2003, 07:07 PM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	You can stab the HEI directly in there, but be carefull on which way you point it, the belts will rub on it onless you put it in a certian position. (even then it'll be close. If it is too close for your liking, you can get all the pullies off an HEI equipped 425/472/500.

12-09-2003, 07:10 PM	#13
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Cool, thanks guys!

12-10-2003, 12:57 AM	#15
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Honestly, I have never considered an AIR pump to be reinstalled on anything I own, so I could not tell you. Actually, I have never noticed a smog pump on one of these big blocks...I'm sure they installed some, but i have never seen one.



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