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  • With the modern tooling, 3 and 5 angle cuts, in a wordno. BUT It's always a good pract to double check the of any machine shop. SeatWhat mechresto said. I, too, always lap new valves/seats after they've been replaced and cut or ground. I'd add that a liquid leak test is always aI guess i'm old school but I'd want to check them before everything got put back together and then find out you've got a leaker.Yea, I'd lap them, but prior to doing that check for the stem to guide fit too.Great adv from all you guys so a light lapping it will be. I have my block on a stand which will allow me to invert it. After the lapping, I thiNo guessingwe are old school. please make a note of it. lol 48DMopar Flathead Truck Forum Page 53 P15-D24 andApr 13, 2018Valve/Seat Angle P15-D24 Forum P15-D24 and PilotAug 22, 2008查看更多结果
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    Anyway, either take it in to someone or do it yourself, but one way or another get a good, smooth seat. If the seat angle and valve angle are perfect you don't really need to lap the valve in with valve lapping compound. I still like to do it and get a n matte finish all the way around the valve. There are many ways to lap in a valve.