exhaust manifold question (70 Chevelle) - Chevelle Tech
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post #1 of 13 (permalink) Old Jun 28th, 06, 9:20 AM Thread Starter
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exhaust manifold question (70 Chevelle)

Hi Guys,

I have a question regarding my exhaust manifolds.
Here are the #'s I found on them.

Right manifold: 3916178
Left manifold: 3909879
Are these mnifolds for HP applications?
The reason I ask is because they both have pipe plugs in them where the "smog tubes" would go. I thought that the only cars that would come with smog are the "L-78" and LS-6 cars and perhaps cars ment for CA.
In box 40 on my build sheet it has a code of TCS-3 for Air pump & plug.
In box 41, there is code of L34 for air pulley.
Even though these manifolds have the plugs, would they still be correct for my car?

Thanks for your help,
Brian

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post #2 of 13 (permalink) Old Jun 28th, 06, 9:53 AM
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Re: exhaust manifold question (70 Chevelle)

Those are for the HP(solid lifter) cars not the L-34 car. Someone has changed them. Part numbers are the same and appearance is the same. but only the LS-6 and L-78 got smog in 70.

ALbert

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post #3 of 13 (permalink) Old Jun 28th, 06, 10:53 AM
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Re: exhaust manifold question (70 Chevelle)

As Al stated,those are correct for Special Hi-Perf applications,L-78 & LS-6,not regular Hi-perf. like L-34 & LS-5.
Don't confuse these A.I.R. Manifolds with the California emissions RPO NA-9 option.That is the EEC Charcoal cannister system,meant to capture unspent fuel vapors for cars sold new in Calif. & some parts of Nevada.
The TCS-3 notation is for the Transmission Controlled Spark and is applicable for all Super Sport Chevelles in that box#.
What are the casting dates on those Pipe plugged manifolds?
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post #4 of 13 (permalink) Old Jun 28th, 06, 1:53 PM
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Re: exhaust manifold question (70 Chevelle)

I've heard a rumor that the 4-speed equipped L34, and LS5 also got smog pumps because of the constant closing of the throttle blades during gear changes. Like I said, rumor.
Anybody else hear anything like it, or have some examples that relate.

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post #5 of 13 (permalink) Old Jun 28th, 06, 2:10 PM
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Re: exhaust manifold question (70 Chevelle)

Quote:
Right manifold: 3916178
Left manifold: 3909879
Didn't all Van Nuys cars get A.I.R.? I have sheets for 2 L34s that have TCS-2 and L34 in blocks 40/41 and one 350cid L48 car with TCS-2 and what appears to be CCS. Where was the car built?

Seems if they're on the buildsheet and the buildsheet is for that car, the manifolds would be correct but lacking A.I.R. being reinstalled.

Colvin's book shows bolt manifolds for 396 330hp/350hp/375hp and 454 360hp/450hp applications with variations on both of with and without drilled bosses.

TC Gold #92 ~ August 1998
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post #6 of 13 (permalink) Old Jun 28th, 06, 6:45 PM
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Wink Re: exhaust manifold question (70 Chevelle)

My Leeds built (LS5/automatic) buildsheet shows, (--) in box 40, and (--) in box 41 .......
Manifolds were long gone, when I got the car..........Don
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post #7 of 13 (permalink) Old Jun 28th, 06, 7:10 PM Thread Starter
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Re: exhaust manifold question (70 Chevelle)

The car was built at the Lakewood plant in Atlanta, GA
Build date for the car is 5/29/70
Where is the date code on the manifolds located?

Thanks,
Brian
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post #8 of 13 (permalink) Old Jun 29th, 06, 12:21 AM
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Re: exhaust manifold question (70 Chevelle)

Brian,
date codes are on the back side against the block.

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post #9 of 13 (permalink) Old Jun 29th, 06, 9:45 AM
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Re: exhaust manifold question (70 Chevelle)

Quote:
Originally Posted by RixLS6
I've heard a rumor that the 4-speed equipped L34, and LS5 also got smog pumps because of the constant closing of the throttle blades during gear changes. Like I said, rumor.
Anybody else hear anything like it, or have some examples that relate.
All L-34 and LS-5 build sheets in my possesion, including the LS-5 I own show no smog due to (--) in box #41. The TCS-3 in Box #40 does not indicate presence of a smog pump and in fact I have several sheets that show this on cars documented without smog. All LS-6 and L-78 Build sheets show the TCS-3 in Box #40 and have either the DA smog pulley stamped code or AIR in box #41. So it would seem that box #41 is the box used to determine smog or non-smog. I believe even the L-34 code in box #41 still means non-smog, as I have a sheet for a car built in Atlanta and shipped to West Virginia that has the L-34 code and is not an RPO NA-9 as is known as the California emissions package.

It is pretty clear to me due to my ongoing research that all L-34 cars and all LS-5 cars have no smog, and all L-78 and LS-6 cars have smog.

There is another wildcard in the sheets. We have found Arlington Texas sheets with (**) in both box #40 and #41. The sheet I have is for an LS-6. While some may think this means no smog, closer examination of the build sheet legend shows this is the code for standard to production, and therefore would have smog. Why these sheets are different is anybodys guess.

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post #10 of 13 (permalink) Old Jun 30th, 06, 8:11 AM
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Re: exhaust manifold question (70 Chevelle)

Underlining everything Jeff said,on 1970 L-78 & LS-6 Chevelles,I have found that engines that came brand new with the A.I.R SMOG system,will have the YE fan belt showing in either box #36 or #37 on their buildsheets,regardless of what plant they were assembled at,including Arlington,Tx.

The YE belt is a longer Fan belt to include the A.I.R SMOG pump pulley on the solid lifter engined vehicles,and this belt even has the YE prefix stamped into it.
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post #11 of 13 (permalink) Old Jun 30th, 06, 9:10 AM
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Re: exhaust manifold question (70 Chevelle)

I'd say you guys have cleared up that one pretty nicely. Makes sense.

Rick
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post #12 of 13 (permalink) Old Jun 30th, 06, 12:57 PM Thread Starter
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Re: exhaust manifold question (70 Chevelle)

Thanks for all your help guys,
I guess I'll have to pull the manifolds off and see what the date codes are.


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post #13 of 13 (permalink) Old Jul 1st, 06, 12:13 AM
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Re: exhaust manifold question (70 Chevelle)

you could try a mirror Brian.

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