whats the difference? 3.1 and 3100

iv always wondered whats the difference between the 3.1 and 3100 motors are along with the 3.8 3800, 3.4 3400, ect. So im guessing the displacements the same they just wanted to call it something diffferent? i dont know.
thanks for any help

Yeah, I think there all the same, except the 3100 and 3800 3400 are vortec versions with dif heads of something

Same with the 5.0 litre became the 5000 vortec same with a 5.7 becamr a 5700 vortec

I think the difference is heads.

i always thought it was 3.1 liter or 3100 cc's (cubic centimeters, another measure of volume)

Young Chuck is correct. A 3.8 and a 3800 are the same thing, just a different way of saying it. For instance my motorcycle is a 1.3 Litre engine or also known as a 1300 cc. My Chevy is a 1.6L or a 1600cc. Or if you prefer, the car in my avatar is a 7.4L or 7400cc. Just depends on where you put the decimal.

Whether a car has a vortec engine makes no difference in engine size. Vortec is a configuration of the engine. 3.8 is the size of the engine. For instance a 426 Hemi is a 426 cubic inch engine with a Hemi configuration. One could have a 426 cubic inch engine and not have it be a Hemi. In my avatar, my car has a 440 Magnum. 440 cubic inch is the engine size and a 440 may or may not have a Magnum cam.