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Topic: Is this a bogus LT-1 engine?

in Forum: C3 Engines


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Is this a bogus LT-1 engine? (12/22)
 3/31/07 1:14pm
Benelli 22
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Palmyra, PA - USA

Vette(s):
1970 Vette Convertible, driver 1981 Vette, driver


Joined: 2/9/2007
Posts: 26

Thanks Jim O.
The data plate on the console appears to original because it looks like it has 37 years of wear and tear.  The data plate is 350 CID and 350 HP and 11:1 compression ratio.  Does this help in identifing?
Is this a bogus LT-1 engine? (13/22)
 4/2/07 1:15am
NorskyLifetime Member
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West Burke, VT - USA

Vette(s):
SOLD - "The Toy" - '70 Convertible
SOLD - "The Beast" - '90 ZR-1 (#682)
SOLD - "Betty" - '28 Ford Model A Tudor
Still have - "BLKBRRD" - '78 Pontiac Trans Am


Joined: 1/23/2002
Posts: 7190

If it was a true LT-1 the data plate would read 350 CID and 370 HP.
 

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Jim Olson 

"The Toys"...!!!  Save the Wave!

Where I've been in a Corvette...!!!

Is this a bogus LT-1 engine? (14/22)
 4/3/07 9:41pm
Benelli 22
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Palmyra, PA - USA

Vette(s):
1970 Vette Convertible, driver 1981 Vette, driver


Joined: 2/9/2007
Posts: 26

Gunslinger...you are amazing!   Where did you locate the XCD suffix?  A lot of others looked.  The guy who is trying to sell me the engine told me that the engine was never actually in a Vette.  The engine was built to LT- 1 specs and purchased over the counter from a GM dealer.  The engine was put in a Jeep (go figure).  Anyway, allegedly the engine has only 4000 miles.   I know someone who is going to take a look at the engine for me. 
 
Jim O. points out that the data plate should read 350  and 370.  I know the data plate in my car is 350 and 350.  Is there a downside to spending the money to put the LT-1 engine in a vette that was originally a 350 HP?
Is this a bogus LT-1 engine? (15/22)
 4/3/07 10:13pm
Gunslinger
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Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior


Joined: 9/8/2003
Posts: 3398

I have a book called "Chevy Small Block Suffix Codes...Factory Engine Identification Code Guide". I forget where I got it from but it is available. I think it was either Summit Racing or Jeg's, but I suffer from CRS...Can't Remember Sh!t.

If you want to put an LT-1 equivalent engine in your car...it's your car and your money. Do what you want. The only possible downside is maybe some loss of value from being a numbers matching vehicle (if it still is one anyway). That means something to some people (purists), and means nothing to other people.

As I said...it's your car. Do what makes you happy.   
Is this a bogus LT-1 engine? (16/22)
 4/3/07 11:08pm
NorskyLifetime Member
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West Burke, VT - USA

Vette(s):
SOLD - "The Toy" - '70 Convertible
SOLD - "The Beast" - '90 ZR-1 (#682)
SOLD - "Betty" - '28 Ford Model A Tudor
Still have - "BLKBRRD" - '78 Pontiac Trans Am


Joined: 1/23/2002
Posts: 7190

[QUOTE=Gunslinger] ... If you want to put an LT-1 equivalent engine in your car...it's your car and your money. Do what you want. ...   [/QUOTE]
 
I agree.  Seeing as the car's current engine isn't correct for it anyway replacing it with a spec built LT-1 would make the car a BLAST to drive.  Then just get a new console plate to advertise the new engine's specs (and save the current one!) to make everyone else jealous...!!!  LOL  LOL  LOL


______________

Jim Olson 

"The Toys"...!!!  Save the Wave!

Where I've been in a Corvette...!!!

Is this a bogus LT-1 engine? (17/22)
 4/4/07 8:05pm
daveb12
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KERNERSVILLE, NC - USA

Vette(s):
1968 L-71 convertible


Joined: 1/13/2004
Posts: 1355

You may want to compare the price of a brand new warrantied crate motor to the price of one you can't see inside of.

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Is this a bogus LT-1 engine? (18/22)
 10/1/10 9:10am
knickick
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Kansas, KS - USA

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Handsome


Joined: 10/1/2010
Posts: 1

I know where to find them. If you are interested to know it, just PM me. :D
Is this a bogus LT-1 engine? (19/22)
 10/1/10 11:25am
MikeMc71
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Tucson, AZ - USA

Vette(s):
1970 White L-46 Air Roadster, 1971 White LT1 Coupe, 1971 Red Auto Air Coupe, 383 stroker, 430 HP, 2002 Millennium Yellow Auto Coupe


Joined: 10/7/2007
Posts: 341

Here is a little info that might help. The LT-1s had different front springs fron the normal Vettes. The wire on them was actually a smaller diameter, don't ask me why, they just were. If it is a 350/350 car, it will not have the TI ignition, but it will still be 11:1 comp ratio. LT-1s ONLY came with HD rear ends at 3.70, a single fuel line from the tank, (the L-46 have two lines), they ONLY came with M-21 Muncies, and NEVER had A/C offered until 1972.  As Norsky mentions, the ZR-1 package had all of the options as the LT-1, BUT it also had the HD brake package, HD sway bars, and a few other changes.
 
It sounds to me like you might have the L-46 car, which is a VERY nice car as well, HEY I own one!


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Is this a bogus LT-1 engine? (20/22)
 11/3/10 1:57am
playtimeover
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Minneapolis, KS - USA

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Blue


Joined: 11/2/2010
Posts: 2

[QUOTE=Benelli 22]My 1970 vette has a 1977 engine...not my choice for the engine but I got what I got.  I knew the engine was NOM when I purchased the car.  I have found a 1970 engine that the engine owner says is an LT-1 with 4,000 miles on the motor.  I would like to make contact with someone who can give me advice on engine numbers and suffix and the economics of spending the extra money for the LT-1 engine.  The suffix for this engine is XCD.  This engine was never in a Corvette but was purchased over the counter from a GM dealer in 1970, again, as the owner says.
 
Thanks for you advice.
[/QUOTE]

My friend knows about the 1977 engine. If you are interested, PM me and I will contact him so that he can help you. Will wait for your further response. :D
Is this a bogus LT-1 engine? (21/22)
 11/20/10 9:26am
spf70
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Scarborough, ME - USA

Vette(s):
70 LT1 Roadster 72 T-top


Joined: 10/20/2010
Posts: 1

My first post on this forum! Looks like this thread is a little old but thought I would through in my 2 cents.  First, congrats on owning a 70.

 

I have a 70LT1 Vert and have been looking for the right parts to build the motor back to original. It is worth it to me as I am sure the car is an 70 LT1. I have probably looked into around 25 engines claimed to be an LT1 and only one of them was real and that came out of a Z28.

 

One thing is certain; the numbers you have listed mean this is not an LT1 engine. If it were a factory replacement block for that year it would be a CE block.

 

Other things you want to look for to see if it was "built to a 70 LT1", cant tell you how many times I have heard that and most aren't even close -

Solid lifter cam (3972182), aluminum GM intake, Holly card list number 4555, crank will be a forged 1182 (3941182 is the full number but you should se the 1182), pistons will be domed number 3989051, fuel pump will have one line in only.

 

Before I invested money building an original LT1 I would make sure the car is an LT1. I only say that because you can build a better motor for less money as technology has changed a lot since 1970.

 

Real quick checks on the car that should tell you – single fuel line with no return lines, 6500 red line on the tach, should have either the transistor ignition or the three holes where it used to be on the front driver side fender well, no expansion tank on the brass/copper radiator, heavy duty U clamps holding the U joints on the half shafts. They can have several different rear ends – mine has a 4-11 so that won’t help you.

 

Long first post, sorry I ama little to close to this subject. Let me know if you want more info.

Steve

Is this a bogus LT-1 engine? (22/22)
 11/20/10 9:15pm
ranger3Lifetime Member
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North Charleston, SC - USA

Vette(s):
1975 L48 AT AC T-top


Joined: 3/20/2004
Posts: 4176

Steve,
 
Thanks for the very informative post. No apologies necessary for the length. We are all looking to build our knowledge base, regardless of how long we've been here or how many posts we have. Great to have you with us.
 
Scott
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