C3 LT-1 Crate Engines

[Bill C.]

[Terry M.]

Re: C3 LT-1 Crate Engines

Bill
The gap between the timing chain cover and the back of the water pump leads me to believe this is a "long-leg" pump that is not compatible with a Corvette installation. Beyond that observation, I have never heard of that code. I don't have my Chevrolet issued engine codes with me so I can't check them right now. The leading X does puzzle me in that usually the leading character is a C for car and T for truck. I am not sure what a marine application would be coded and without those Chevrolet documents I mentioned I am at aa loss.

[Mark F.]

Re: C3 LT-1 Crate Engines

Bill ...Beyond that observation, I have never heard of that code. I don't have my Chevrolet issued engine codes with me so I can't check them right now. The leading X does puzzle me in that usually the leading character is a C for car and T for truck. I am not sure what a marine application would be coded and without those Chevrolet documents I mentioned I am at aa loss.

Terry and Bill,

Checking Ed McComas' Lime book, I only see two engine codes that begin with "XC" as follows:

Vehicle	Code	Year	CI	HP	Equipment
Truck	XC	69	350	255	4 Barrel Carb, and Power Glide Trans.
Replacement Engine	XCB	62-63	327	??	??? none listed

[Patrick H.]

Re: C3 LT-1 Crate Engines

I have a couple of photos of these engines in the crate.
No idea of the application, but they did/do exist.

[Dennis C.]

Re: C3 LT-1 Crate Engines

There is a 1970 LT1 XCD crate engine in the original crate for sell now on Craigs List with several photos: https://phoenix.craigslist.org/nph/p...432497703.html

[Patrick H.]

Re: C3 LT-1 Crate Engines

There is a 1970 LT1 XCD crate engine in the original crate for sell now on Craigs List with several photos: https://phoenix.craigslist.org/nph/p...432497703.html

That is the same engine pictured in the first post.

[Philip A.]

Re: C3 LT-1 Crate Engines

Bill
The gap between the timing chain cover and the back of the water pump leads me to believe this is a "long-leg" pump that is not compatible with a Corvette installation. Beyond that observation, I have never heard of that code. I don't have my Chevrolet issued engine codes with me so I can't check them right now. The leading X does puzzle me in that usually the leading character is a C for car and T for truck. I am not sure what a marine application would be coded and without those Chevrolet documents I mentioned I am at aa loss.

The intake is interesting too as it has a provision for oil fill tube which is plugged. Wouldn't this date the motor to before LT-1?

[Joe L.]

Re: C3 LT-1 Crate Engines

The intake is interesting too as it has a provision for oil fill tube which is plugged. Wouldn't this date the motor to before LT-1?

Phillip-----


The 1970 LT-1 manifold, GM casting #3972110, was machined for an oil fill tube which was plugged with a cup plug for the LT-1 application. This same manifold was sold in SERVICE for quite awhile and that's probably why the machining for the oil fill tube was done so that it could be used for earlier small block applications.

Also, the engine shown is a Camaro version of the LT-1 as it has the long leg waterpump and non tach drive aluminum distributor. Both would have to be changed to use for a Corvette.

[Leif A.]

Re: C3 LT-1 Crate Engines

Is it just me or does this engine exhibit a lot of oil seepage around the timing chain cover for an engine that is advertised as having never been out of the original crate. Again, JMHO, but doesn't show like a brand new engine to me...looks like she's been run some. Also, on the top of the bell housing.
Quote from ad: "vintage 1970 Chevrolet LT-1 engine that has never been removed from it's original 1972 GM crate!"

[Joe L.]

[Patrick H.]

Re: C3 LT-1 Crate Engines

I don't know that it's used, but it was most definitely not stored well.
I see some characteristics that point to unused, but what a bunch of dirt, grime and oxidation.

[Paul D.]

Re: C3 LT-1 Crate Engines

Were they using silicone or RTV sealer in 72? That looks like what was used to seal the end gaskets on that intake. Also, the large vacuum port on the rear of the intake looks to have been occupied before. Mismatched plugs on the front of the intake strike me as odd. May be a new engine, but I think it has a good story to tell. Chip.

[Patrick B.]

Re: C3 LT-1 Crate Engines

Phillip-----


The 1970 LT-1 manifold, GM casting #3972110, was machined for an oil fill tube which was plugged with a cup plug for the LT-1 application. This same manifold was sold in SERVICE for quite awhile and that's probably why the machining for the oil fill tube was done so that it could be used for earlier small block applications.

Also, the engine shown is a Camaro version of the LT-1 as it has the long leg waterpump and non tach drive aluminum distributor. Both would have to be changed to use for a Corvette.

[Mark F.]

Re: C3 LT-1 Crate Engines

I know I have "floaters" in my aqueous humor, but that sure looks like an "R" on the "never been out of the crate" engine...???

Crate Engine R Distributor_001.jpg

[Joe L.]

Re: C3 LT-1 Crate Engines

The 1970 LT-1 intake manifold was not machined for an oil file tube. I believe a 1969 Z-28 manifold was machined for an oil filler tube and plugged, but I don’t if the 70 Z-28 manifold used the same arrangement.

Patrick------


Well, th 3972110 manifold must have been manufactured both with and without the oil filler machined orifice. I have seen many of these manifolds which did have the machined orifice and I believe the manifold on the pictured engine is one of them. In addition, the GM blueprint for this manifold specifies the orifice to be machined.

However, I have never seen an example of the 71-72 manifold, GM #3959594, with a machined orifice and the blueprint does not specify it.