Hello, before anything,
DO NOT RUN it!
Engine noise is a tall tale of something hitting!
Retrace your steps for the removal of VC-Injector wiring and spacing.
With removal, do a Valve rocker one at a time, looking for fresh marks, a spacer, and a valve cover for hitting marks.
Continue removing ALL injectors so you can rotate the engine by HAND while watching your push rods go up and down to see if a push rod is seated into the lifter correctly.
Also, note or see if any fluid is coming from the injector port.
Now while apart use straight edge lay over your tips on intake and exhaust from 1CYL to 2CYL so forth to see if tips if ANY are lower for stuck open valve, pay close attention see if ANY Broken Valve Springs and to your
#6 area.
If you can access an air compressor, apply air into the injector hole and have someone listen to the exhaust as you can lister with the intake ram off the plenum.
With the valve train off, with Air Applied you should NOT hear anything out there areas.
ENGINE noise will not go away, run rough maybe but NEVER heavy knock or rattle.
When You Have a Engine Noise, it's always good to RECHECK recent work FIRST.
Do not ever restart, thinking it will pass.
If testing shows ok at this point, assemble only the
#6 rocker and perform lash for this six cyl, only paying attention to the movement of the push rod and rocker, seeing it move evenly up-down and keeping lash adjustment.
On the uneven cranking is mechanical compression LOSS without any fuel starting, normal will crank is even while spinning. Valve lash to tight or bent push rod or broken valve spring or hanging valve rocker can cause unseating valve while cranking. If hung open then valve can hit piston causing knocking.
for homme made compression test put one injector in at a time and crank by hand felling if same pressure tightness is felt? Being cautious before you use starter is to see if repairable with minor interference by mistake or something out of place.
Starter Cranking is the last thing in this process, as what is causing the KNOCK or noise you describe.
Remove and rotate by hand, I suggest remove front fan and drive belt to have area to do all testing if your alone.
I hope this helps.
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