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1955-1976 Pontiac Engine Production Casting Numbers

  
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1955-1976 Pontiac Engine Production Casting Numbers

 
4zpeed 4zpeed
Enthusiast | Posts: 368 | Joined: 04/13
Posted: 12/02/13
06:58 PM

Year            Displacement     Casting Number
1955                287                     518037

1956                317                     521560
 
1957                347                     523293

1958                370                     528456

1959                389                     532000

1960                389 Super Duty    536387 (4Bolt)

1961                389                     538181 (4Bolt)
                       389 Super Duty    542426 (4Bolt)
                       421 Super Duty    538181 (4Bolt)

1962                389                     538181
                       421 Super Duty    538181 (early) 548913 (late)(Both 4Bolt)
                               
1963                326                     548211
                       389                     543680
                       421 Super Duty    544988

1964                326                     9773153
                       389                     9773155
                       421                     9773157

1965                326                     9778840
                       389                     9778789
                       421                     9778791

1966                326                     9778840
                       389                     9778789
                       421                     9778791 (early) 9782611 (late)

1967                326                     9786339
                       400                     9786133 (2&4 Bolt)
                       428                     9786135 (4 Bolt)

1968                350                     9790079
                       400                     9790071 (2&4 Bolt)
                       400 Ram Air         9792506 (4 Bolt)
                       428                     9792968 (2&4 Bolt)

1969                303 Ram Air V      546313  (Short Deck)(4 Bolt)
                       350                     9790079
                       400                     9790071 (2&4 Bolt)
                       400 Ram Air IV     9792506 (4 Bolt)
                       400 Ram Air V      9792968 (4 Bolt)
                       400 Ram Air V      545887   (4 Bolt)
                       428                     9792968  (4 Bolt)

1970                350                     9799916
                       400                     9799914
                       400 Ram Air III    9799914 (4 Bolt)
                       400 Ram Air IV     9799915 (4 Bolt)
                       400 Ram Air V      481708   (4 Bolt)
                       455                     9799140 (2&4 Bolt)
             
1971                350                     481990
                       400                     481988
                       455 HO                483677 (early) 485428 (late)(Both 2&4 Bolt)

1972                350                     481990
                       400                     481988
                       455                     485428 (2&4 Bolt)

1973                350                     488986
                       400                     481988
                       455                     485428 (2&4 Bolt)
                       455 Super Duty    490132 (4 Bolt)
               
1974                350                     488986
                       400                     481988
                       455                     485428 (2&4 Bolt)
                       455 Super Duty    490132 (4 Bolt)

1975                350                     488986 (early) 500810 (late)
                       400                     488986 (early) 500557 (late)
                       455                     500813

1976                350                     488986  
                       400                     500557
                       455                     500813

1977                301                     525934
                       400                     568557

1978-79           400                     568557



Useful links:
http://www.pontiacpower.net/engcode01.html
http://www.spottsperformance.com/engineid.htm
http://ronspontiacpage.com/indexes/index.html


Let me know if anyone has anything to add, sees something wrong or has more relevant info to share. Just enter it as a reply to this post and I will add it for a update.

Thanks,
Frank  
Poncho huggen gear snatchen posi piro.

shyrgfuh3 shyrgfuh3
Enthusiast | Posts: 459 | Joined: 11/13
Posted: 12/03/13
07:40 AM

i think this should be a sticky and i think you should now add which if any of these are 4 bolt main blocks, so there 4zpeed.  

Pontiacman8 Pontiacman8
Moderator | Posts: 5776 | Joined: 02/08
Posted: 12/03/13
08:26 AM

568557 1977-79 400 180, 200, 220

Yes will make this sticky.  
Engine builder,self taught auto body guy.
Horsepower sells engines and torque wins races

Pontiacman8
Pontiacman8
Pontiacman8

shyrgfuh3 shyrgfuh3
Enthusiast | Posts: 459 | Joined: 11/13
Posted: 12/03/13
08:41 AM

568557 1977-79 400 180, 200, 220

i don't understand what this meand.


xxxxx


Yes will make this sticky.


ok, cool.

is it still possible for the the op or one of you guys to add the 4 bolt main info to it?  

Pontiacman8 Pontiacman8
Moderator | Posts: 5776 | Joined: 02/08
Posted: 12/03/13
08:46 AM

yes either 4zpeed can or I can.
I think this should be added as well.
568557 1977-79 400 180, 200, 220.  
Engine builder,self taught auto body guy.
Horsepower sells engines and torque wins races

Pontiacman8
Pontiacman8
Pontiacman8

shyrgfuh3 shyrgfuh3
Enthusiast | Posts: 459 | Joined: 11/13
Posted: 12/03/13
08:57 AM

yes either 4zpeed can or I can.

ok thanks, lets make 4zpeed add the 4 bolt info,lol.


xxxxx


I think this should be added as well.
568557 1977-79 400 180, 200, 220.  

ok, got it thanks

ci = 400, hp = 180, 200 or 210e  

Poncho462 Poncho462
User | Posts: 103 | Joined: 01/12
Posted: 12/03/13
02:36 PM

I notice, for example, that the 1970 455 block casting number 9799140 is the only block listed as a 455 in 1970.  I have that block casting, ID "XF" and it is a 4 bolt block(listed as 370 horsepower from Grand Prix), but I don't know if all of those block castings were built as 4 bolt mains, or some were 2 bolts, some 4 bolts, which is possible.  On the list above, no notation either way is given for that block casting.  Just FYI.  
"Wherever you go, there you are."..Buckaroo Banzai, 1984

4zpeed 4zpeed
Enthusiast | Posts: 368 | Joined: 04/13
Posted: 12/03/13
02:47 PM

Pman:
"I think this should be added as well.
568557 1977-79"


No problem Pman.

shyrgfuh3:
"ok thanks, lets make 4zpeed add the 4 bolt info,lol."

Anything else 70bird? Cup of coffee, light for your smoke, lol.



OK that should do it. Let me know if anyone has anything to add, or if you have more info just enter it and I will add it to the initial post up top. That way it is readily available and accessed at a glance, thanks.

Frank,  
Poncho huggen gear snatchen posi piro.

shyrgfuh3 shyrgfuh3
Enthusiast | Posts: 459 | Joined: 11/13
Posted: 12/03/13
05:27 PM

shyrgfuh3:
"ok thanks, lets make 4zpeed add the 4 bolt info,lol."

Anything else 70bird? Cup of coffee, light for your smoke, lol.


Oh, perhaps just a Martini on the rocks my good man...stirred, not shaken...

Congrats, you are now an official sticky owner, good job.

I was considering recommending posting another we had discussed earlier...


70 bird, I think.  

4zpeed 4zpeed
Enthusiast | Posts: 368 | Joined: 04/13
Posted: 12/03/13
10:28 PM

Thank you Poncho462, It is the only casting I have found for a 70 455 but have seen it listed both ways, 2&4 Bolt. I appreciate all the information I can get as this will serve to help everyone.  

1970 Fullsize YH - 2 BOLT      WG XF - 4 BOLT
1970 GTO WA YA YC - 4 BOLT

Code    Application     Displacement    Compression    Horsepower   Transmission Heads Camshaft Carb
XF     FullSize 4 Bolt         455               10.25:1             370                Auto         64        67       4 bbl


Thanks,
Frank  
Poncho huggen gear snatchen posi piro.

shyrgfuh3 shyrgfuh3
Enthusiast | Posts: 459 | Joined: 11/13
Posted: 12/04/13
04:55 AM

casting 9799140 = 1970 455

Fullsize YH = 2 BOLT      WG, XF = 4 BOLT

GTO WA YA YC - 4 BOLT



9799140 455 ci code WG, XF, YA and YC show as 4 bolt main from one source. WA and YH show as 2 bolt mains from the same source however WA and YH are both 360 hp engines. YC is also a 360 hp but listed as a 4 bolt. It would seem that all 360 hp engines would have the same number of bolts on the mains therefore i think some additional research should be done to verify these particular codes before adding them to the list. frankspontiacparts.com would be one possible resource for the info.



455 360 HP WA,YC,YH
455 370 HP WG,XF  

4zpeed 4zpeed
Enthusiast | Posts: 368 | Joined: 04/13
Posted: 12/04/13
10:49 AM

This is what I have on the 1970 455 block by code and application. So casting # 9799140 was 2&4 Bolt.


Code    Application     Displacement    Compression    Horsepower   Transmission Heads Camshaft Carb
WA        GTO  4 Bolt         455               10.25:1             360              Manual       64        68       4 bbl  
YA         GTO  4 Bolt         455               10.25:1             360               Auto         64         67       4 bbl
YC        GTO4 4 Bolt         455               10.25:1             360               Auto          64        67       4 bbl
YH     FullSize 2 Bolt         455               10:1                  360               Auto         15         67       4 bbl  
WG    FullSize 4 Bolt         455               10.25:1             370              Manual       64         68       4 bbl
XF     FullSize 4 Bolt         455               10.25:1              370               Auto         64         67       4 bbl


Frank
Wink  
Poncho huggen gear snatchen posi piro.

shyrgfuh3 shyrgfuh3
Enthusiast | Posts: 459 | Joined: 11/13
Posted: 12/04/13
11:45 AM

Hi 4zpeed,

Ok, your first post had WA as a 4 bolt, this post has it as a 2 bolt. I posted the ronspontiacpage info below yours and they both match. The problem still remains as to whether there is a possible error on the 360 hp engines. I'm just no believing some would be 2 bolt and others 4 bolt.

"1970 GTO WA YA YC - 4 BOLT"

The page below has WA and YH as 4 bolt blocks. This is much more believable to me.You might want to consider adding this page to your existing one since it kills 2 birds with one stone by having the block number, year, ci, hp, carb size, number of bolts on the mains AND engine code all on 1 page. . I doubt there is any copyright on it.  

http://www.pontiacpower.net/engcode01.html



Icon Quote4zpeed:
This is what I have on the 1970 455 block by code and application. So casting # 9799140 was 2&4 Bolt.


Code    Application     Displacement    Compression    Horsepower   Transmission Heads Camshaft Carb
WA        GTO  2 Bolt                455               10.25:1             360              Manual       64        68       4 bbl  
YA         GTO  4 Bolt             455               10.25:1             360               Auto         64         67       4 bbl
YC        GTO4 4 Bolt         455               10.25:1             360               Auto          64        67       4 bbl
YH     FullSize 2 Bolt                          455               10:1           360               Auto         15         67       4 bbl  
WG    FullSize 4 Bolt         455               10.25:1             370              Manual       64         68       4 bbl
XF     FullSize 4 Bolt         455               10.25:1              370               Auto         64         67       4 bbl





XXXXX


WG  FullSize  4 Bolt    455 10.25:1 370 Man  64 68 4 bbl
XF   FullSize  4 Bolt     455 10.25:1 370 Auto 64 67 4 bbl


WA  GTO                   455 10.25:1 360 Man  64 68 4 bbl
YA   GTO      4 Bolt     455 10.25:1 360 Auto 64 67 4 bbl
YC   GTO      4 Bolt     455 10.25:1 360 Auto 64 67 4 bbl
YH   FullSize               455 10:10:1 360 Auto 15 67 4 bbl  

4zpeed 4zpeed
Enthusiast | Posts: 368 | Joined: 04/13
Posted: 12/04/13
07:00 PM

70bird
"Ok, your first post had WA as a 4 bolt, this post has it as a 2 bolt"

That was my fault as I am not pasting the info, the WA is a 4 bolt, I did edit that post.

"The page below has WA and YH as 4 bolt blocks. This is much more believable to me."

I have that link but it depends on who's word you take in the end, here is Spots performance, they have it listed as 2 bolt and 4 bolt. I'm looking at other sources as well.

I see many codes/applications for the 70 455 and only one casting # 9799140. They used different heads, cam, and compression for these. I doubt all 1970 455's were 4 bolts but anything is possible.  


70 FULLSIZE: YH - 2 BOLT  WG XF - 4 BOLT

70 GTO: WA YA YC - 4 BOLT


http://www.spottsperformance.com/engineid.htm

Frank  
Poncho huggen gear snatchen posi piro.

shyrgfuh3 shyrgfuh3
Enthusiast | Posts: 459 | Joined: 11/13
Posted: 12/05/13
03:42 AM

"I doubt all 1970 455's were 4 bolts but anything is possible."
 

yes it is not good getting conflicting info, it makes it hard to determine the facts. This is why I suggested calling a real person like Franks Pontiac's to verify it. I would prefer not to guess and guess wrong and post incorrect info. Hey, if we wanted to post inaccurate info we could just copy it from one of the "other" forums...ouch.

One glaring fact is that all 70 Pontiac 455's were high perf engines. This seems more unusual to me than the possibility that they all might have 4 colt mains.

In 72 and 73 ford made all the 351 Cleveland engines 4 bolts so these things do happen.

A 70 428 Ram Air Cobra Jet is 335 hp, a 70 455 LS6 Chevelle is 360 hp, it seems to me that a 360 hp Pontiac engine with over 10:1 compression might be considered a high perf engine even if it was installed in a Ventura.  

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