216 question

[Speedbumpauto]

Doesn't the rear leg of that intake feed both 5 and 6 cylinders? If so, at idle and other high manifold vacuum situations, it could simply sucking air through a loose rear leg of the intake, especially considering how those things were held on. Compression test is a reasonable thing to do, however.

[dwcsr]

Originally Posted by Speedbumpauto

Doesn't the rear leg of that intake feed both 5 and 6 cylinders? If so, at idle and other high manifold vacuum situations, it could simply sucking air through a loose rear leg of the intake, especially considering how those things were held on. Compression test is a reasonable thing to do, however.

The manifold feeds cylinders 1-2, 3-4, 5-6 and could be leaking. But typically that would cause a lean miss fire not excessive smoke at all speeds. Lean miss fire should cause a puffing noise out the pipe. If the compression test shows good then look at the vacuum at idle and high speed to see if its normal and not bouncing. This video is good at explaining what the vacuum readings mean

Vacuum Gauge Test - YouTube