Back to the original question, are you talking about the draft tube that sticks out the side of the block by the distributor?
If so, I have at least a half dozen different types on the shelf out of a myriad of years of 216/235 engines, so there were quite a few...
Jeff
YES thats the tube.
I was interested in 1947 thru 1955 1st series crank case vent tubes.
But if have a shelf full of different types takes some pictures and post them just to see what GM made.
Because once there gone there gone for good. Historically Speaking of course.
I'm kind of partial to the S shaped curvy type.
Thanks
jorb