Topic: Is this a bogus LT-1 engine?
in Forum: C3 Engines
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Former Member
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Palmyra, PA - USA
Joined: 2/9/2007
Posts: 26
Vette(s): 1970 Vette Convertible, driver
1981 Vette, driver
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.
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Lifetime MemberSHELBYVILLE, TN - USA
Joined: 7/5/2002
Posts: 3942
Vette(s): 1976 L48 auto
1978 L82 4speed
1994 LT1 6speed
1978 L82 4speed
1994 LT1 6speed
Well..... i cant find a "XCD" suffix... did find a "XC" which came up as a 1969 Camaro
as for casting numbers... well... here's a link to a website with all that good stuff
| XC | 1969 | 350 | 255hp | 4bolt | Powerglide |
good luck hunting...
StingrayJim 
NCM Lifetime Member #1936
Stingray's '76���������������������������� StingrayJr's '78���������������������������Lil Red '94 
(click each one to see a bigger version)
Former Member
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Frederick, MD - USA
Joined: 9/8/2003
Posts: 3398
Vette(s): 1969 convertible L71 427/435 4-speed black interior
I found two "XCD" suffixes...one is a 350 truck engine for 1999 rated at 255hp. The other is listed simply as a 350 crate engine...no further information.
Crate engines are built to varying levels of tune using the same block. No telling what that engine is without more information from it.
No way of proving it's an original LT-1 from 1970 unless someone can find information linking that suffix code to LT-1's. It could be built to LT-1 specs possibly.
Crate engines are built to varying levels of tune using the same block. No telling what that engine is without more information from it.
No way of proving it's an original LT-1 from 1970 unless someone can find information linking that suffix code to LT-1's. It could be built to LT-1 specs possibly.
According to the NCRS Pocket Spec Guide the Engine codes for 1970 LT1s
were CTU and CTK. The CTK was new to 1970. Both were 350ci,370hp,
4 barrel Holly carb, mechanical lifters and T/I ignition.
Scott
Scott
the other thing to remember is that thier was only about 1243 lt-1 install in all of the 70 vettes.
Gold MemberThe LT-1 engine was also used in the Z28 Camaros.
For the Z's I think it was CTC or CTK.One being auto the other a 4 speed.I shouid know this by heart,I've only had 5 of them!!! Those cars were so much fun.I'd be crusing around in second gear right about 3000rpm(The sweet spot)then jump on it and scare the carp out of the guy next to me.zgator 2007-03-23 09:49:21
One way to tell if it is from a Vette is to look at the partial VIN. It will have the "S" for St. Louis. If it from a Camaro it will have a "V" for Van Nuys or an "N" for Norwood. Look at the rear of the block to get the casting date. If it is a 4 bolt main 3970010 casting with a casting date between December of 1969 and August of 1970, it could be an LT1. The partial VIN would tell the tale if it hasn't been restamped.
Lifetime MemberC3VR Founder
Eagleville, PA - USA
Joined: 11/1/2001
Posts: 18377
Vette(s): Used to own a 1979 Corvette now owned by JB79
David,
I'm curious now how the above advice worked out for you. Let us know!
I'm curious now how the above advice worked out for you. Let us know!
-Adam Wartell
NCM Lifetime Member #1222
Founder: C3 Vette Registry
C4 Vette Registry, C6 Vette Registry
My first Vette, now owned by JB79:
Former Member
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Palmyra, PA - USA
Joined: 2/9/2007
Posts: 26
Vette(s): 1970 Vette Convertible, driver
1981 Vette, driver
Hello to all who replied to my question...been out of town...sorry about the slow reply. Your collective responses are helpful. For now, I've decided to back off buying this engine. My restoration project has a way to go before I'm pressed for the engine. I'm certain that I'll have other restoration questions as this project goes forward.
One reply mentioned that there were a limited number of LT-1's. Can I tell from the VIN number if it is an original LT-1 car? In the area behind the gear shift lever is a data plate, but the data plate is well worn. From what I can determine, the data plate says 370 HP. It would be helpful if I had a build sheet, but I'm not certain where or it one is available. Any suggestions?
in Forum: C3 Engines
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