Intake - small letter “No Name” S1MS

[6s1640]

Hi all,

I picked up this intake years ago because of its uniqueness and similarities to a S1MS 1965 GT350 intake.  The nameplate is blank.  The temp sensor  provision is the smaller version.  There's no firing order nor part number . The  casting features for a PCV connection are absent and the casting sprue, typically with a manufactured marking,  has been trimmed off. There is a threaded hole in the very aft runner, No. 8.  What is the origin of this Intake?  Is it a prototype? Is it a test part to validate the casting? Is it an early production part?  Is it someone's creation by modifying a S1MS manifold?  It's a mystery to me. What do you think?
Thanks for looking
Cory

[brandosaac]

I cant tell you, but it does look like a small letter intake casting
without any numbers or letters , maybe its a sample / test run?

[Bob Gaines]

I have seen one or two in years past which that had numbers and letters where the Cobra letters would be. The small diameter temp was what stood out on the early style in my mind because I have seen the later version that was similar but they had the larger sender hole and a threaded PCV vacuum port.