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Are you sure that's not 300-450KPA? That would put it at 45-60 psi, which is typical good fuel pressure.

Found some HD valve springs : https://puredieselpower.com/class-8-products/8.3l-12-valve-cummins-improved-heavy-duty-valve-spring-4936076.html#/product/15347

To add to the bigger benefits of hiking up timing... #1, better mpg. #2, lower EGT. #3, less torque on the low end is less strain on the trans and ujoints. The trans will survive longer with more rpm.

Yes, exactly. The head bolts make a distinct sound as they pop thru the hood. I mean the cackle (clatter) as you hit the pedal from idle.

I'll know by listening if the timing is too high.

It's low tech, and very basic once you see how it's done. This is my basic idea of what happens, minus a couple fine details. -Pull out the timing pin in the pump. -Line up the timing marks so you can put in the pin, but dont put in the pin. -break loose the nut on the end of the pump. -Make...

We(you and me) are going to do the timing. Not just you winging it alone. Marysville isn't all that far from me

That's what I offered earlier in the thread. I find it easier to do the method described by 74M35, than to use the spill port method. I timed my 12Valve Dodge this way a few years back, and it took 3 tries to get it in the sweet spot. I started a little high, then backed it off, then forward a...

I should have some time starting in December, if you want, you and me can get pix and video of yours getting timed.

By chance, has anyone called in to a Cummins dealer with their ESN to see what the factory timing is supposed to be?

On some data plates they state timing at the pump, not the crank. So, your 8 degrees may actually be 16.