Oil leak - gathering oil on the right header below the engine mount

[piranha-bro2]

I was very happy with the cast iron guides, probably bronze from now on.

piet

I think my original cast guides (no seals) had done 160,000km when i swapped them out for SFC 7mm. I still have them somewhere and they were still well within tolerance to valve stems. I LOVED cast guides.

Bronze = stainless-only )or hard=chromed steel) valves, yes?

 

[redax5]

500 twins have valve guide seals on the exhaust and inlet sides direct from the factory, using cast iron guides

we have our valve guides made by AV&V in Canada, Advanced Valve trains and Valves and they are made from Manganese Bronze alloy
also have our valves made there which are coated stainless, using that set up we run valve guide seals on exhaust and inlet
we aim for 0.025mm stem clearance

started using AV&V after our cylinder head man told me to stop machining my own guides and get them made in bulk, Ollie was responsible for designing a lot of their Harley range of valve train parts