Alvin,
"LS1" is specific to all aluminum 3rd generation smallblock that came out in 5th gen Corvettes I believe in 1998. The next year it was in Camaros and Firebirds and an iron block, aluminum head version in trucks and SUVs. The iron blocks have different designations, for example the 5.3l truck motor is an LM7. They were branded "Vortec" in trucks but this just continued a brand used back in time that started in the 80s on older motors.
All sequentially fired GM V8s of this architecture are generally referred to as "LS" motors. There is substantial interchange of the parts and accesseries between all of these motors. You can even buy aftermarket blocks. They are on "Gen IV" versions now. LS3 is in current Camaros.
In stock form these motors are recognized by single coil packs for every cylinder mounted on the valve covers, single throttle bodies, plastic intake manifolds, and uniformly spaced exhaust ports.
You have one in your Silverado. Hot Rod magazine turbocharged a stock 4.8l truck LS motor to 1200 horsepower in a durability test -- they are good motors and folks transplant them into everything. They are a favorite for Mustang guys read this months Car Craft magazine all three cover cars are F*rds with Chevrolet motors in them two are 5.3l truck motors.
Also they get transplanted in just about every other car/truck. Horsepower TV show put one in a Nissan. Also have gone into airplanes just about anything that moves.
Street Rodder magazine built a AD shop truck with am LS this months issue.
I have a 5.3 LS to go into my 59 Task Force.
I am going off the top of my head and did not look anything ip but I believe this information to be accurate.
