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Hi Doc Joe - sorry about your troubles... A few questions;

1) Is this on the S/C car?
2) What "point" in running it, (or symptoms - if you will) lead up to "...found no compression in number 1..."? (Looking for the "event" that would have caused the valve to bend and/or the head gasket to go.) - Long idle - got hot? High rev/heavy load run? Parked in gear on a hill? Just woke up one morning and "bam!"...?
3) How many miles since the last rebuild (if ever?)

As far as "tap" marks on the pistons; it is not un-likely to have bent valves and not be able to see the tell-tale dings on the pistons. It doesn't take much.

As far as the guides - been there - change them! Don't take a chance regardless of the miles since they were last done! The machinist might be looking at the "oval" qualities of each guide and still miss a hairline-crack due to the lateral pressure on the guide from a knocked valve! It takes just ONE to have a smoker on your hands after "rebuild" - change them all!

They could do a simple test too; John at Autosport in Seattle (does all of Ferrari of Seattle's rebuild and head work) has a nice simple air-hose setup on a bench. The hose is connected to a rubber pad that he presses up over the combustion chamber (with the valve in) - spray some soapy water around the BASE of the guide (on the top-side of the head) and bubbles quickly show you leaks around the guide - even if there is a leak between the guide and the aluminium of the head!)

Testing the inside of the guide by itself is more tricky - they can run vacuum on it, (but then again - why? Just change them all.)
 

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Stick with the German "Goertzie"? valve-stem seals.
 
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