I have a brand new set of bare L92's with seats installed in them from GM. I also have brand new L92 valves to put in them. Should I lap the valves/heads? I was thinking of just using a fine grit compound if I did lap them. Any tips you guys might have are all welcome.

 

take them to a shop and have them do a valve job on them properly.

 

Even if everything is brand new? The seats already have a three angle valve job right from GM.

 

I'm with you. Lap them to make sure the the valves are seating properly.

 

Its just hard to believe that you would need machine work done to brand new valve seats,valves and heads.

 

Only reason I say to take them to a shop, is that i dont know your ability so thats why i recomend a shop, if you have the ability and knowledge then yes you can lap them and verify with the dye.

 

I have hand built engines before,mostly small block chevys. I just havent assembled a set of brand new heads/valves before. A few of the old timers said they use a blue sharpie on the valve and the seat to see how they mate. They tell me its the next best thing to the dye. lol!