Ls3

i need to know if the 376 cubic inch motor is just a bored and stroked 350

Are you talking production engines?

Are you talking GM production engines?

Did you make a typo when you typed “376” meaning to type “396”?

The 396 is not a “bored and stroked” 350

Some odd aftermarket displacements can come from stroked 350’s (383 being common)

Aim your attention towards “big block” and “small block”