3rd gear knock... I need expert advice PLEASE
Ok guys, i really need help here. I've had it. I cannot figure out why i get so much knock in 3rd gear, upto 3-4 degrees pulled. In 2nd gear at the same RPMS and same airflow, a/f ratio, etc.. i don't get the knock. What is so different about 3rd gear? I'm running 93 octane, 75/25% Alky/water injection and about 22-23psi. I've tried richening it, leaning it and still can't figure it out. I also went back to zero on the timing sliders. Sometimes i get more knock in 3rd gear than other times.
I don't have boost leaks, no exhaust leaks, my wires are brand new and so are the spark plugs. The head was all polished when it was out in the spring. The tops of the pistons were cleaned down to the aluminum as well. I don't suspect any carbon buildup.
ANY help would be greatly appreciated!
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