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View Full Version : I.D. block of a 472

mayo
10-21-2005, 08:33 PM
Hi I am a newbie. I have a 67 gmc pickup I got from some kid. I want to find out what year 472 I have so I can get parts. Like a dipstick and tube(that was broken when I got it) Can someone point me in the right direction?
BigJohn
10-22-2005, 11:43 AM
Hi Mayo,

Look on the back of the block on the passenger side where the trans bolts to the block. This is where the engine casting number is. You may also want to pull a valve cover and get the head casting number also. These are the two simplest numbers to get. These two numbers should tell you what you have. If you let me know what they are I will look them up in the Cadillac Engine Tech Guide for you. You may also want to purchase one of these books from MTS. It is very helpful when working on these engines.
Hope this helps
Big John
mayo
10-22-2005, 09:46 PM
Thank you I will get back to you soon.
frankenstang57
10-22-2005, 10:08 PM
:evil: #$$%^#, there's a site out there I can't find from home. I have a printout sitting on my desk at work of a site with ID's and changes year to year. If nothing else, I can send you the link on Tuesday... :evil:
shakedog
10-23-2005, 02:29 PM
This might help..............
http://www.geocities.com/MotorCity/Pit/9364/guide/Engineid.html
STDog
10-24-2005, 07:43 AM
Hi I am a newbie. I have a 67 gmc pickup I got from some kid. I want to find out what year 472 I have so I can get parts. Like a dipstick and tube(that was broken when I got it) Can someone point me in the right direction?

Not that it really matters much. The dipstick and tube depends on the oil pan. front/mid sump or a rear sump pan from a 500? the same tube can be used either way, you just have to cut the top a little for a 472 (about 3/4")

Only one real change in the blocks, and that was when the 500 came out. The older blocks had some oiling differences and need work for a longer stroke (like in the 500). The old blocks were used up in 472s and then the same block was used for both engines. Anthing after mid '70 will have the 5200 block, '68 and '69 the older block. You might find an early block in a '70 deville, but most had the 5200 block.
mayo
10-24-2005, 02:20 PM
The number I fond was on the back of the block almost in the middle it is 1486238 that is the only # I could find on the block. I found a V4 on the heads?
Nashalac
10-24-2005, 02:37 PM
That's a 68 / 69 472
mayo
10-24-2005, 02:50 PM
Thank you. Is this one of the 10:1 engines?
Nashalac
10-24-2005, 04:01 PM
If you click on the link in the Shakedog post there is a lot of info that should answer a lot of questions. :roll:
frankenstang57
10-24-2005, 07:40 PM
:evil: Same site I was going to recomend. I just saved it to my work computer. Whoohoo, it's now saved at home! :evil:
CadillacPat
10-28-2005, 01:59 AM
mayo,
You have a '68-early '69 472 (500's didn't come out until '70 and all 500's were 5200-series blocks-last four numbers of the block casting number ending in "5200"). These early blocks had smaller main oil galley passages (3/8" vs. 1/2" from what I have read). However, you also have 76 cc small-chamber heads. All 472's except the '74 engine had these heads.
Andy V
10-28-2005, 10:27 AM
Mayo,
If you pull the valve covers and you may have to remove a pair of rocker pedestals to see it, but you need to find the casting number of the heads to be sure what your compression would be.

If the motor was swapped complete (68/69 472) then it would be a 10.5:1 motor.

Have you run it? If so and it pings (detonates) easily on regular octane gas, and maybe even 93 octane gas...pretty sure sign it's a 10.5:1 motor.

If the previous owner had the motor apart it's hard to tell what piston/head combination might be in it.
CadillacPat
11-02-2005, 05:34 PM
Mayo and Andy V,
When I first bought my '68 Sedan with a 472, I had no idea it had a CR of 10.5:1. It ran great on 87 octane, but I never "loaded" the engine or used it to tow. It wasn't until I joined this board over three two years ago(the older one) that I found out my motor was high compression. So, for normal driving on a moderate day (and I dove mine car in August in Michigan with the temps in the 90's), and, not loaded or with a heavy foot, it should not ping.
Andy V
11-08-2005, 09:47 AM
Cadillac Pat...interesting but I'm not sure I can believe an all original 68 472 running on 87 octane. Maybe at the right elevation and driving on a flat road w/ easy throttle actuation.

At least from my experiences...my old motor would ping sitting in park with 87 (not really)...
I had to run 93 or 94 with timing limited...of course I liked heavy-foot it a lot too.
CadillacPat
11-08-2005, 04:20 PM
Andy V,
"interesting but I'm not sure I can believe an all original 68 472 running on 87 octane. Maybe at the right elevation and driving on a flat road w/ easy throttle actuation"
Yes-all original; I took the motor apart before I sold it and it had the original closed-chamber heads and "binocular" pistons. Yes-at basically sea level. Yes-on flat roads (we don't have mountains around here, only slight inclines). Yes-with light throttle; with heavy throttle it would ping slightly. Finally, as I mentioned, I was totally shocked when I found the '68 Caddy I had bought had a factory CR of 10.5:1.