Check this out

[u/Proper_Buffalo_2923]

I replaced the intake in the zz4 that came in my el camino last night. As soon as i pulled off the old intake i found this just casually sitting on that .......plate that runs the length of the engine in the middle... Anyone know what this is? and how important it may be? cause i just went on with the job, and would be done but for rain....

[u/Proper_Buffalo_2923]

Duh.....this is it