1990 Toyota Landcruiser Flow separation in th inlet valve g

I put 6 cyl on the top because there was no option for 5 cyl as the car I just bought is a 5 cyl diesel engine landcuiser. I noticed that another car that has a 4 cyl diesel engine was overtaking me uphill. I have a suspicion that the valve intake gap was not measured properly, I opened the top of the engine and noticed that two of three of the valves were not closing properly, so I rearranged them and made a similar gap between the round flat metal that pushes the valve to open and the top crankshaft, I put them on number 15 on the scale that looks like a hand fan, I noticed that the engine is more powerful, does anyone know if this is the right measurement or not?

Any help would be highly appreciated.

Many thanks.