Solid lifter valve settings, if that is what you have are dependent upon a number of factors: How hot you run your engine ie what thermostat, rear gear, stock cam or aftermarket, how much wear on the rocker arms? Go slow and decide how you will be using your truck.Check timing after setting valves. The 59 engine was drilled for either solids or hyd. As you know the I6 engines are generally a low rpm engine therefor if you run a tighter valve setting it will push up the rpm range and it may not run as good as it did with a looser setting on intake and exh. If it has an aftermarket cam check the cam card hot settings and adjust from there wider or tighter. From experience if an engine is new the .006 for the intatke is too tight for a 59 235. Higher mileage engines may tolerate the .006. You will get better gas mileage, easier starting and run cooler with a looser setting such as .009 to .011 on the intakes. Make sure you open up the exhaust setting an equal amount setting somewhere between .011 to .016. You want a little valve noise, when its fully hot, but not to the point where you think you will break a rocker arm. Wider exhaust settings will allow the valve more time on the seat and transfer heat better an the engine will run cooler. An excellent web site is
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