I’m going to have to give this method a try. Purchased the pdd degree wheel. I did how ever play with the timing a little bit. I stuck to my chart for now. I tried advancing the timing up to 34*. Truck seemed to have lost midrange, but seemed to pull harder above 3500 rpm. Boost went down, smoke staid the same, egts staid the same. Lowered the timing to 28* egts actually went down 50-100*, boost went up 6psi from 34*s smoke was the same. Truck felt very strong in midrange, about the same top end. It was hard to tell because I burst another intercooler boot. I expected all of the above except reduction of egt lowering the timing and topend feeling the same with the lower timing.
I’m wondering with a stock 12v piston even with the 145* injectors, thin washers, and .010 over headgasket maybe 30* is too much timing?