I found 2 boxes of intake and exhaust valves in my garage and don't know what the go to, can anyone help?

on one box it says "LBC Tulip EX .100L 1.910"
on the other box is "LBC IN IV 2031 .100L 2.25p (the writing is faded on this one, but I think this is what it says).

They appear to be originally from Del West Engineering

Thanks in advance