1968 440 block markings -S (Special)
 

Hi-



Block = PT 440 S 24690503

The PT is Trenton Plant
440 = 440 CI Motor
S = Special Motor
2469 = May 1st, 1968
0503= Last 4 of Vin

Can anyone tell me what Special Motor means?

i only have two 1967 factory service manual, one chrysler, one dart,coronet, charger. i found no info on the letter S. at first i thought the S-special meant HI Performance. but i found this on the internet.

http://www.moparts.org/


Other Stampings
Additional stampings may be found on the ID pad.
They identify non standard engine components.*
A - .020 oversize cylinder bores
Diamond - oversize tappets
E - Cast Crankshaft
HP - High Performance
L or LC - low compression
M - .001 undersize main bearing journals
Maltese Cross - .001" undersized bearing shells
Maltese Cross and an X - .010" undersized crankshaft
O.S. - .005 oversize valve stems
P - premium fuel
R - regular fuel
RX or MX - all main or rod journals .010" undersized
S - special engine
WT or TW - water test
X - .010" undersize crankshaft

my next guess is police.

are you sure it is not a 5 ? 440-5 means that the casting mold has had 5 parts replaced during it's life

yep lynn has a good idea. i remember on the old 392s counting the clock arrows for casting thickness.