1970 Engine Emission Control Information Labels
Engine emission control information labels are affixed to the radiator-support panel and provide specifics on some tune-up information such as ignition timing & dwell and idle RPM for a given engine/transmission application.
Early (top) vs. late (bottom) LS6 Emission Control Label
Arlington
Label Broadcast Code | Engine - Transmission |
AO | 307 - After February |
AQ | L65 |
AR | L34 - Manual - late |
AS | LS5 (sequence 250565) |
AT | L34 - Automatic (268338) |
AZ | LS5/LS6 - late |
DM | 307 - Through February |
DP | L34 - Manual - early |
DQ | L34 - Automatic |
DT | LS6 - early (211308) |
Where a sequence is shown, it is either the latest on record or a single.
Atlanta
Label Broadcast Code | Engine - Transmission |
AO | 307 - After February |
AQ | L65 - Starting 03-26 |
AR | L34 - Manual starting 03-11 |
AS | LS5 - Manual starting 03-23 |
AT | L34 - Automatic Starting 03-12 |
AW | LS5 - Automatic |
AZ | LS6 - Starting 03-11 |
CR | L48 - Starting 04-30 |
DM | 307 - Through February |
DN | L65 - Through 03-06 |
DO | L48 - Through 12-18 |
DP | L34/LS5 - Manual through 03-10 |
DQ | L34/LS5 - Automatic through 03-10 |
DT | L78/LS6 - through 03-10 |
Baltimore
Label Broadcast Code | Engine - Transmission |
AG | L65 - Manual |
AO | 307 - After February |
AR | L34 - Manual starting 03-09 |
AS | LS5 - Manual starting 03-31 |
AT | L34 - Automatic Starting 03-10 |
AZ | LS6 - Starting 03-03 |
CR | L48 - Starting 03-03 |
DD | L48 - Through 02-23 |
DM | 307 - Through February |
DN | L65 - Through 02-18 |
DO | L48 - Through 02-23 |
DP | L34/LS5 - Manual through 02-26 |
DQ | L34/LS5 - Automatic through 03-02 |
DO | LS3 |
DT | L78/LS6 |
Kansas City
Label Broadcast Code | Engine - Transmission |
AO | 307 - After February |
AQ | L65 - Starting 03-13 |
AR | L34 - Manual starting 03-11 |
AT | L34 - Automatic Starting 03-10 |
AW | LS5 - Automatic starting 03-11 |
CR | L48 - Starting 04-08 |
CS | LS3 |
DM | 307 - Through February |
DN | L65 - Through 09-18 |
DO | L48 - Through 02-23 |
DP | L34/LS5 - Manual through 03-05 |
DQ | L34/LS5 - Automatic through 02-25 |
DT | L78/LS6 |
Van Nuys
Label Broadcast Code | Engine - Transmission |
AO | 307 - After 04-16 |
AQ | L65 - Starting 04-16 |
AR | L34 - Manual starting 03-11 |
AS | LS5 - Manual starting 03-12 |
AT | L34 - Automatic Starting 04-07 |
AW | LS5 - Automatic starting 03-10 |
AZ | LS6 - starting 04-01 |
CR | L48 - Starting 05-11 |
CS | LS3 - Starting 03-24 |
DM | 307 - Through 11-12 |
DN | L65 - Through 02-09 |
DO | L48 - Through 01-30 LS3 - Through 10-07 |
DP | L34/LS5 - Manual through 01-05 |
DQ | L34/LS5 - Automatic through 02-24 |
DT | L78/LS6 - Through 02-21 |
Caveat:
Starting dates and through dates are based on legitimate
build sheet data I have - current as of 09/03/2023. There is
typically a larger spread of dates on non-SS Chevelles since build
sheet data are harder to come by.
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