This will hopefully shead some light on these intakes.The 3972110 is a production 1970 only intake for Corvette, Yenko Nova and Z28 Camaro with 350ci 360-370 horse motors. This intake has no hole in the front for the oil filler tube.These are date coded underneath the oil splash shield on the bottom.

The 3972116 is a near identical intake.However this intake is a service replacement or over the counter part.Meaning this was not used at the factory assembly line.While it looks correct these intakes will have a later date codes on them underneath the oil splash shield on the bottom.This intake also has a oil filler hole in the front which is mostly capped with a freeze plug.