I took off the processor from an old system but I forgot to take note of which way it'll go and since the pins are the same on all sides theres no way of figuring it out

Can someone tell me which way to put it in??? (The obvious trial and error is not possible as I don't have anything but the computer , no cables, no screen no nothing.)
Oh and the mobo's socket 3 is bigger than the CPU so that no matter which way I put it in, there's a row of pins that's empty all around the CPU. Did 486 CPUs come in different sizes???
Oh and a funny thing: even with the CPU out, when I power it up, it says : 33Mhz. I always knew these displays were BS but that's taking it a bit far dontcha think???