Smokey Yunick NOS 67 Z-28 MO 302

[iluv69s]

The bottom xram intake base is the earliest dated and production numbered crossram I have seen. It is dated April 1, 1968. only about 4 months after the first prototype crossrams were made by GM engineering with prototype o-dash part numbers. This intake came with the prototype oil splash shield underneath (which I show removed to see the dates and part number location). This intake has many characteristics of the prototype intake that did not make the final revisions for the later 'production' xram intakes.
The part number on the bottom of the base was soon after moved on later intakes to outside next to the winters snowflake logo..and the date code to inside the intake so it could be seen without removing the intake from the car.
Note the winters snowflake on a raised pentagon different from the later 'production' intakes. There are minor differencesthroughout this intake that are different than the early o-dash intakes and the later 'production' intakes...

[iluv69s]

The xram top is from the first batch of the earliest dated crossrams made inside GM engineering for the racers such as Roger Penske and Smokey Yunick. At first in this era, they were strictly backdoor top secret experimental pieces that only went to GM insiders.

Notice the o-dash part number (experimental)...
and the date Dec. 1967...

[iluv69s]

Hopefully I can get this baby going this year (century)..and eventually feel the 7500 rpm shifts and the dual holleys with the xram setup !!!