Valve Lapping

I took the heads apart and as expected the valve faces and seats were pretty gunked up and pitted, not to mention all the crap and leaves that were in the cylinders. Since I didn’t have money to get the valves recut, I decided to lap them. Most people are against this, but this is a budget build, so screw it. I used a hand drill and a little piece of air hose to do the job. Again, most people advise against this, but there was way too much pitting to do it by hand.

There was a fair amount of buildup and pitting on the valve faces

The seats weren’t as bad, but they definitely needed some lapping

Lazy way of lapping the valves using a hand drill and a piece of air line. You have to be really careful when using the drill, its pretty easy to screw up. Make sure to lift off pretty often and switch rotation. Also keep checking the seat width to ensure you stay within the spec. Of course the best way is to get them cut at the shop, but if you must, a hand lapper is the next best thing.

You can see that the valves still have some pitting, but I wanted to stay within the seat width spec.  Lapping the valve more would look nice, but it would cause all kinds of problems in the long run. From what I read, a wide seat allows for too much heat transfer from the valve, which can cause some serious carbon buildup.