Changing my exhaust springs question

[fastmark]

After I solved the turning tool fit problem tonight. I started on the exhaust springs. I found #1 tdc and changed it. I think the piston needs to be at TDC when I change each spring. I do not trust the valve seal to keep the valve up. If a valve was to drop, it would really ruin my day. My question is this. How many degrees of crank rotation is needed to bring the next cly(#5) up to TDC. I would assume 180, but at this point , I do not want to just guess.

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Mark Faught, 92 ext cab service truck and a 84 crew cab one ton dually with a 91 cummins and NV 4500.

 

[mark93]

It takes 120 degrees to get the next piston in the firing order to be at TDC compression stoke.

For an even firing 4 cycle engine, the number of degrees between firings = 720/# of cylinders.

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'93 W350 Club Cab, Bright White, 5 sp. , 136K, Factory Options: LE package, 4. 10 Limited Slip, 7600 lb. rear springs, tachometer, front stabilizer bar. Mods: Banks stinger plus, Linex bedliner, 25,000 lb gooseneck ball, 10,000 lb receiver, Tekonsha brake controller, POWER WAGON injectors-WAY faster than stock!.