How does a leak-down test confirm good/bad valve guides?

How does a leak-down test confirm good/bad valve guides?

No. The 355 that I had a PPI done on a few weeks ago had the heads removed for "de-carboning" 3 years ago. I saw the pictures. It was full of hard carbon. Enough that it prevented an exhaust valve from closing properly, burning the valve. A Ferrari engine doesn't run any tighter or more efficient than a Honda engine. I know nobody wants to hear that, but the Honda S engine (from roughly the same time period as the 355) made more power per liter than the 355.

My point in starting this thread was that the Ferrari guys seem to think a leak-down check will tell them the condition of the valve guides, and generally other car enthusiasts tend to disagree. I just found it interesting.

Rick

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