Any one hear of a 70 LS6 Vette

[joevette57]

If you look in the 1970 Assy manual you will see towards the rear of the manual there are several pages covering the LS-6 option for 1970 Corvettes. You will also notice that each page is stamped with "CANCELLED".
From what I've been told, due to the 1969 strike, the LS-6 option was eliminated for the Corvette for the 70 model year. However, They were available over the counter during the time as well as an optional engine for the 1970 Chevelle. (It's been pointed out to me several times that the 1970 Chevelles were available with more HP than Corvettes).
I wouldn't doubt that somewhere along the line some of these engines made thier way into the engine bays of some Corvettes. Were they installed by the General? I doubt it. (BUT.... you never know....)
I don't have my assy man anymore as I recently sold my '70. But if I remember correctly it also had a tri-power set-up.

 

[Eddie 70]

Well, is there any new news on the 70 LS6 vette. I am waiting to hear the good news.

 

[Crimson Thunder]

according to Karl Ludvigsen,GM built a couple of LS7 Corvettes in 1970.Although none were sold to the public,two were stolen from the GM proving grounds.Maybe thats his car?I doubt it, but its just a thought.

 

[MsSchroder]

maybe that explains why he hasn't posted in 5 days...

 

[Eric]

according to Karl Ludvigsen,GM built a couple of LS7 Corvettes in 1970.Although none were sold to the public,two were stolen from the GM proving grounds.Maybe thats his car?I doubt it, but its just a thought.

But the mythical LS7 and LS6 were different animals if memory serves. The LS7 was to be a big block version of and LT-1 and would have been rated at 465hp.

- Eric

 

[Tom Bryant]

LS6 and LS7 were single 4 bbl and the LS7 was available as an over the counter engine assembly GM part number 3965774. This was a complete engine less intake and exhaust manifolds. It was listed as H.D. like the L88 and probably would have replaced the L88 on the option list if it had been released for production. The over the counter engine assembly used an iron open chamber head that was basically the same as the aluminum 2nd design ZL1/L88 head, the ZL1 camshaft and high compression ratio similar to the L88.

One odd thing I find in the parts book is the listing for a head for these 2 engines even though they weren't available. The older books have many listings for common options listed as "except H.D. ect. but few parts specifically for 454 H.D. (Some parts for special options that weren't released seemed to make it into the books on occasion. If you could have actually gotten them if ordered is another matter altogether.) It is part number 3981070 for both engines and noted as aluminum. From this I gather that if these engines had made it to the Corvette RPO list and went into production that the Corvette LS6 and LS7 would have had aluminum heads for the weight savings, where the production Chevelle LS6 and the over the counter LS7 would have had iron heads of nearly identicle configuration. The '71 LS6 had aluminum heads and seem to varify this point.

In response to the last post the LS6 would have been the big block counterpart to the LT1. Both carrying the nomenclature of Special High Performance and both being 11:1 compression, solid lifter cam engines. The LS7 was the 454 equilivalent of the L88 and both were labeled H.D. (heavy duty).

 

[djkls6]

Hello All,
I'm sorry but I'm in California right now for work. I have no way of getting the information you guys need. I've tried to explain it to my wife but that is a moot point. I will be back in town hopefully no later than friday. I can post all information needed to satisfy all of your needs. Who knows, this car may be a rare find and it may not. Thanks to all that have responded to this topic and I will post all information on friday. I just have to know what I'm looking for. Please stay tuned!

Darren

 

[djkls6]

Wonders never stop. My wife has emailed me the vin number my vette for you. 194370s406295 She has no idea where to look for the numbers off the block. She also mentioned something about a part number 3989371. I'm not sure what she read it off of though. This should may help until I get back in town on Friday.
I do apologize for not posting anything sooner but those who own their own companies can probably understand. Thanks,

Darren

 

[djkls6]

Here is another number

My better half is really coming through for me. She claims that she has a number off of the intake, although she describes it as the thing that sits on the top of the engine...ha ha. That number is GM 3963569. She did say she tried looking for the block code but has no idea what she is looking for. This may help a little more.

Darren

 

[Eddie 70]

Ok, according to the Black Book the vin corresponds to a 1970 Corvette Coupe.
I was unable to come up with anything else for the other numbers. I am by no means a know it all though, I just happen to have a black book. Hopefully someone with a little more resources can come up with an answer for your other numbers.

Check out the 1970 Corvette Registry. Maybe Juliet there can help a little more. It is an interesting story to follow.

 

[djkls6]

Thanks Eddie,
I'll try the 1970 registry. Thanks for the help. I will post the numbers on the block hopefully friday night (depends what time my flight actually gets in).

Darren

 

[Yoda]

#3963569

454CID
1971
Corvette
Square Port
Aluminum
425HP
LS6
Low Raise Manifold

It should be noted that the same manifold was used it
'70 ~ Camaro & Nova (402 CID) L78
'70 & '71 Chevelle (454 CID) LS6

 

[Chick]

They DID make a few of the 70 454 LS6's but they were not put out to the general public. They were used for engineering and executive cars.

My plant manager at CPC Framingham GM plant had one, so I saw it first hand.

 

[Tom Bryant]

#3963569

454CID
1971
Corvette
Square Port
Aluminum
425HP
LS6
Low Raise Manifold

It should be noted that the same manifold was used it
'70 ~ Camaro & Nova (402 CID) L78
'70 & '71 Chevelle (454 CID) LS6

That low rise intake was the same one my El Camino LS6 had and was called the LS6 intake by us parts guys. At the time it was commonly believed that the low rise design was so the LS6 could go in the Corvette with the standard big block hood. If they were to use the L88 high rise design the L88 hood would have been necessary.

 

[djkls6]

Hello guys,
Here are the numbers I have for you. Engine code CPW and the number is 3963512. Since I don't have a book I have no idea what that number means. I did speak to my grandfathers brother and he has informed me that the car was some sort of special order car for the the owner of that particular dealership but he did not remember the name of the dealership. Fortunatley he is still around and did recall some things about the car. He did tell me that the car was purchased by my grandfather in late 1970(not sure what month exactly) and that no modifications were ever made on the car. He did purchase the car brand new. He actually remembered the day he bought it because he came over to show the car off, then left a patch in the street as he left. That's all that I have. Please let me know what these numbers mean.
Thanks,
D

 

[Tom Bryant]

Darren,

Thanks for sending the numbers. Here is what I find.

CPW is the suffix code for 1971 LS6 with 4 speed. The 3 letter suffix with the first 2 letters being CP doesn't show up in Corvette or passenger car til 1971. The 4 codes are CPH, CPJ, CPW and CPX with W and X being LS6; W a 4 speed and X a THM400.

The 3963512 casting number was used on 1970 and 1971 454s in both low and high horsepower versions and also in 1969 on the 427 late production engines, all horsepower versions.

If you will supply the rest of the stamped numbers that were there with the CPW we can establish a build date on the engine.

Tom

 

[Rob]

Darren,

Is it possible for you to electronically scan a copy of the window sticker and either post it here in the forums, or email a copy of it to me and I can post it here? Let me know.

 

[djkls6]

Tom & Rob,
To answer your questions I would be glad to send a copy of the window sticker but the condition of it is not the best and when I tried to scan it in last time it came out in some strange language. And as far as the rest of the numbers they are all X's. I just assumed that they were not part of the actual number. So it just reads XXXX etc. Like I said I don't know a heck of a lot about vettes so I may be looking at the wrong thing. I won't be up much longer. Still on CA time and I need some sleep so I will try to check in tomorrow. Tom/Rob thanks for your help and I'll try to scan the window sticker again now to see if I have any luck.
D

 

[Tom Bryant]

Even a bad scan might show something. G'nite.

Tom

 

[a69vette]

Darren, If you want, bring the window sticker tomorrow. I'll take some pix for you, and post one up here for everyone to see. I'll see you tomorrow.
Rick