[Big White]

Does anyone know what code TCS-2 in block #40 (Air Pump & Plug) means on a 1970 Baltimore build sheet?

 

[DaleM]

Good question. I've seen TCS-2 on just about every big block engine/transmission combos with and without DA in next block depending on A.I.R. or not and I've seen TCS-3 on many of the same big block engine/transmission combos. Can't figure why there are two codes...

 

[elcamino]

Well one of the terms associated with TCS is "Transmission Controlled Spark" which included a vacuum/electrical switch on the engine and that may be the broadcast code for the switch for that engine/trans/carb combo? Pollution control device.

 

[Big White]

Mike -
Your explanation sure makes sense. Spark control didn't even enter my mind when I read Air Pump & Plug.

Dale-
We've all seen instances of build sheets from different plants utilizing a different code for the exact same part/assembly in the exact same numbered box. Do you think that might explain the difference between the "2" and the "3"?

At any rate, thanks for the feed back fellows.

 

[elcamino]

found this...

Since 1968, the federal Clean Air Act has required that auto manufacturers control hydrocarbon emissions. Because the highest levels are typically found at part-throttle cruise, a Transmission Controlled Spark (TCS) system was developed to regulate vacuum advance in this situation. A series of switches and sensors on the engine and transmission were used to limit vacuum advance to specific transmission gear positions and engine coolant temperatures. However, a thermal override switch allowed for full vacuum advance to aid engine operation any time the coolant temperature was above or below a preset operating range.

 

[DaleM]

We've all seen instances of build sheets from different plants utilizing a different code for the exact same part/assembly in the exact same numbered box. Do you think that might explain the difference between the "2" and the "3"?

My point was that examples of two seemingly identical LS6/M40 Chevelles yet one will have TCS-2 and one will have TCS-3 from the same plant.

Same for some LS5's, either M22 and M40 yet one engine/trans will have TCS-2 and the same engine/trans will have TCS-3 from the same plant.

Even put the rear end ratio (3.31 vs. 4.10) in the equation and still found they had the same, either TCS-2/-3.

One would think that (for example) two LS6/M40 Chevelles from, say, Atlanta would have the same set of switches, sensors, etc. for emissons control.

 

[elcamino]

Unless the 3 superseded the TCS-2, does the TSC-3 come later?

Or the destination of the vehicle has an affect on the parts??

Guess we won't ever know for sure,

 

[Leigh Lovering]

for a 1967 El Camino Broadcast Sheet .Line 1
a. Could anyone tell me what the six digit number under "Ident Number" means
b. Next to it is a "letter" Code "E" under Trim what does that mean?
Thanks guys
Leigh Lovering

 

[LeoP]

Leigh, you should really start your own post and not hijack this one. good luck.

 

[DaleM]

for a 1967 El Camino Broadcast Sheet .Line 1
a. Could anyone tell me what the six digit number under "Ident Number" means
b. Next to it is a "letter" Code "E" under Trim what does that mean?
Thanks guys
Leigh Lovering

By 'broadcast sheet' I assume you mean either the Body Broadcast Copy or the Chassis Broadcast Copy sheet? The six digit number is an internal plant tracking code. It doesn't match the vehicle sequence number and I've seen figures as high as 503800 from KC. The Ident Number should also show up on the trim tag - that's how they tracked the specific pieces to a particular car. See a Baltimore trim sheet example here (same number on the two Broadcast Copy sheets).

The letter "E" is the same as on the POP, an interior code - "E" happens to be black vinyl. See 1967 POP decoding here.

Where was your El Camino built?