| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
|
|
#1
06-05-2007, 02:36 PM
|
||||
|
||||
400 Block
I have just purchased a 78 T/A with a 400 engine and noticed on the top of the block when you take off the valley pan, the letters X X. On others like 455 it has 5 5 and 400's it has 0 0, any idea what XX is , the car is numbers matching so its not a replacement? thanks
__________________
1972 Formula 400 auto.Lucerne Blue/Ivory Int.R Console. Numbers matching. Now Sold. 
|
|
#2
06-07-2007, 08:52 AM
|
|||
|
|||
|
W72 ??? good question, I would like to know as well
|
|
#3
06-07-2007, 11:14 AM
|
|||
|
|||
|
The XX means it's a W72 / TA 6.6 Block. The 78 and 79 TA 6.6 blocks had the XX code I have read it is a thicker web block but I really couldn't say but it was the end of the run for the 400
Dave |
|
#4
06-08-2007, 09:15 PM
|
|||
|
|||
|
they did make the 78 79 w72 Block web a little thick. So if you wanted to work the motor up, it could handle more power.
|
|
#5
06-08-2007, 09:38 PM
|
||||
|
||||
|
It's a keeper block.
__________________
If you cant drive from gas pump to gas pump across the map, its not a street car. http://s207.photobucket.com/albums/b...hop/?start=100 |
|
#6
06-12-2007, 12:52 PM
|
||||
|
||||
|
Thanks guys. I like the sound of that. The cars numbers matching so yeah, definenatly a keeper. I have just bought it and on the weekend i was looking through old photos i took of Pontiac Trans am's when i was a kid and found this same car i took a picture of when i was 15, some 22 years ago, originally brown, then white, now red and now mine..
__________________
1972 Formula 400 auto.Lucerne Blue/Ivory Int.R Console. Numbers matching. Now Sold.
|
|
#7
06-24-2007, 01:15 AM
|
|||
|
|||
Yes,that is the W-72 motor,and DEFINITELY a keeper.
It was a thicker block,better oiling(starting in the later half of it's production),starting in 78 the bigger cam putting out 220 hp,better valve springs,whole bunch of better stuff than just a L-78. These cars with the "Z" code are getting harder to find in any condition,I know,I looked for a good one for a while.  Nice find 
__________________
1973 T/A Buccaneer Red L-75 A3,83k mi. #'s match 1979 T/A Atlantis Blue W-72 WS6 23k mi.survivor#'s match 1999 T/A Navy Blue 60k mi....babied  1968 442-gone but not forgotten "Oh,you can think about it,.....but don't do it!" Sheriff Bufford T.Justice |
|
#8
06-25-2007, 09:37 AM
|
|||
|
|||
|
"Z" being a code for Pontiac motor right? I have two Z code 78s and neither is a W72 block car--both are 180 hp Pontiac 400s though.
|
|
#9
06-25-2007, 04:28 PM
|
|||
|
|||
|
Quote:
However in 79 a "Z" code car could ONLY be the W-72,220hp,for it was the only Pontiac motor available in a Firebird,and it had to be a 4spd,otherwise it was an auto with the 180hp 403.
__________________
1973 T/A Buccaneer Red L-75 A3,83k mi. #'s match 1979 T/A Atlantis Blue W-72 WS6 23k mi.survivor#'s match 1999 T/A Navy Blue 60k mi....babied 1968 442-gone but not forgotten "Oh,you can think about it,.....but don't do it!" Sheriff Bufford T.Justice Last edited by Father&Son73T/A; 06-25-2007 at 05:11 PM. |
| Reply |
| Thread Tools | |
| Display Modes | |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Hybrid Mode
