Leaking valves, Ahrghhh! Options

[doory100]

My efing valves are leaking! I lapped them down to the right height as suggested by delta cams. Now after installing the valve springs I poured some paint thinner in the ports to do a leak test and the thinner is coming out through the valves and into the combustion chamber. Any thoughts?? What did I do wrong?

[TerryE]

You might want to take your head in and have it done by a shop that specializes in head rebuilds/valve grinding etc. before you end up buying a new head, new valves, new seats, etc. But it's your dollar. You do know that the valve seats have 2 angles on them? i hope you used proper lapping compound-Clover brand is the preferred type. There is a very expensive machine made by Serdi that is used for valve seats. P.S. you don't lap in valves with a drill-ever. You either do it by hand or with the afore mentioned Serdi, there's another brand too. Our machine shop did heads for customers, only two people were qualified to do the job. You are using "bluing"dye to check the fit? when you're done lapping the valve seat should be just as shiny as the rest of the seat.

This post has been edited by TerryE: Jun 2, 2015 - 1:41 AM