ok i got a 57 chevy 235 3100 and it is missing what i would call the oil filler tube. the only engine i have to compare it too is my dad 216 47 3100 engines look similar but i do not have an oil filler tube all i have is a hole where it should be.
please post pics of what the 57 235 oil filler tube should look like or a link to purchase one... i found an oil filler tube at ecklers

http://www.classicchevy.com/chevy-oil-filler-tube-with-spring-bracket-small-block-1956-1957.html

but as u can see it says its for small block and then on product illustration it shows its for v8. so not sure if that would be the right one or not.. im leaning towards not the right one. any help would be greatly appreciated. ty