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This is timing on an NH855 engine. This is how you can set it to stock.or advance it. https://youtu.be/gV4g8-d3IvA

You have not advanced your timing. That requires the proper tools for shimming the rocker boxes. Unless you removed the compressor and accessory drive and jumped a few gears. You messing with the flathead adjustment in the throttle shaft increases rail pressure which puts more pressure...

One sizer larger non top stop injector would be part # 3054245 with a .024/25 orifice. Not much to it. Cheaper to have someone build it

Bigger injectors will relieve some pressure off the camshaft. You would maybe want to swap to top stop injectors. You would need 6 new clamps and washers, and plungers.

#3054250 injector Barrel plunger # 3054532 Refer barrel # 3202184 Cup # 3012537 Cup holes -size/angle 8-.0065x18 degrees Injector orifice .022-.023 Delivery- 112.5-114.5 Cam 189 Delivery flow- 121-122 120 psi .020 seat orifices If you want bigger injectors call premco. Warren can lead...

Do you have top stops or non top stops? Or what is your esn? I have the injector book and can tell you what your injectors are sized at. r you can call warren at premco in Texas with your ESN