Herb,
ALL Chev aluminum intakes, that I have ever seen, including the 3 carb intake for 53-55 6cyl Corvettes, were cast for GM by the Winters foundry and have a snowflake, as well as GM, somewhere on the intake.
As we speak I am holding in my hand a picture I took at Super Chevy one year of a Z-16 that was supposed to be an UNRESTORED car (want to know how I hold a picture and type at the same time?). As I look very closely with a magnifying glass, it very definitely appears to be an oval port rather than a rect port intake. I am very surprised! I never noticed that, because the 65 Vettes with the 425hp-396 were rect port. I do know that 68-69 ONLY 390hp-427 Corvettes had aluminum oval port intakes, but with a Q-jet bolt pattern (a Holley can be used with one of those adapter plates). Any Z-16 pros out there know if the Z-16 engine was oval or rect port?
The air cleaner in the picture is a closed, dual snorkle air cleaner (black with chrome lid and decals). And it is available from several sources including our sponsor, Ground Up, for $175.-180.. I think this air cleaner was common to a few other engines, such as 1970 Z-28s.
And, if you are a Z-16 lover, I am quite sure that you know there were MANY unique features on Z-16s that were not even available on 65 Malibu SSs.
I hope this helps.
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[This message has been edited by DZAUTO (edited 03-25-99).]