Subject: Re: Rocker pin survival rate!

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I would suggest that you have at least .050"/.060" between
the top of the guide, and the top cap bottom/split collet
bottoms at full lift. The reason for the gap is to stop oil
being forced down the guide. Make sure the top of the guide
isn`t flat, it needs to tapper downwards and outwards from
the valve bore.

Ray Sherratt.