What is E.E.C. ?

[Mr70]

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Thanks Mr70,My parts book only goes to 1970, any 71 -72 usage on this part? 71 454/425HP Corvette?

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No other applications have been found useing #3969835,other then what has been previously mentioned,past 1970..Can't confirm the useage of this insulator on the 71 LS-6 Corvette.
I do see 1971 & up 350cid Corvette used shield #3999198.
Can anyone confirm if the 1971 LS-6 Corvette did indeed use #3969835?

[YENKO DEUCE REGISTRY]

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"Valve" attached to the intake manifold bolt is the TCS switch (Transmission Controled Spark solenoid). This solenoid allows vacumn to advance the dist when transmission is shifted 2nd Gear.

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I thought it was 4th gear?

[Schonyenko2]

2nd gear is correct.

[John Brown]

Then what is the switch on the 3rd / 4th gear location on the Muncie side cover??

[YENKO DEUCE REGISTRY]

Exactly! I thought the pin switch was on the 3/4th gear lever on the side cover - no?

[Mr70]

Getting off topic here,but I think it depended on what transmission a vehicle had.
The intent of T.C.S. was to provide vacuum spark advance during high gear operation ONLY,because eliminating vacuum advance in all but the forward most gear significantly reduced exhaust emissions.
Cars equipped with T.C.S. and either a 3spd.M/T,4spd.M/T or Turbo-Hydramatic,only had vacuum advance applied in 3rd gear.(The 4spd. also had vacuum advance applied in 4th gear too.)
Cars equipped with T.C.S. and either a Torque-Drive or Powerglide trans.,only had vacuum advance applied in 2nd gear.
Any T.C.S. equipped Turbo-Hydra also had vacuum advance applied in reverse as well.

[Schonyenko2]

The solienoid in the area you described is the TCS plug in. I remember that when I got my L78, and my friend got his 70Z, we were just settin in the car messin around with the shifter and noticed when you shifted it through the gears that it gained rpm(we checked both cars). We dug out the manuel, and it said it was called TCS.They got disconnected as we were told they worked against opening the secondaries in the carb. I was pretty sure it was 1st to 2nd, but it could be 2nd to 3rd. I know it was not 3rd to 4th. I expect it still would work on my deuce if I hooked it back up.

[YENKO DEUCE REGISTRY]

Mine is still hooked up, maybe I should disconnect it for SCRXI

[Schonyenko2]

You have to unplug it from the unit by the carb. I'm thinkin you need to block off a vacum line too, but I'd have to look.
If yours is still hooked up, which gear is it, 2nd, or 3rd?
That selenoid is in a different location on a M22. Somewhere on the bottom. I remember we broke the one on mine when we put it in. Still need to take that thing out.

[YENKO DEUCE REGISTRY]

I don't know which gear it kicks in, haven't really paid attention - I'll have to see now