my Low dollar 318 hop-up project

66fs said

Great decision, especially down the road. In my experience always replace the exhaust valves. Stems are worn below specs, displaced metal on the locks, tips scuffed unless good oil is used and changed religiously. Really should have the faces ground, they are typically way off, but your lapping will tell you that.

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I agree, I would have had the seats/valves ground but just not in the build money. So a lapping I will go..... LOL. I will do the alcohol/light test I talked about in the lapping video. I didn't mention this before but I will now: Many of the new valves advertised as a 43* and 44* faces, but the Sealed Power were 45* faces, and the exact replica of the factory. Even weighing 105 grams and having the stem cut out in the bowl area. That's why I choose them.