My engine builder is in constant communication with a guy from FRPP tech that owns a 393 w/supercharger. This guy is telling my engine builder to drill a small hole (about a 1/4 in.) into the butterfly to help with the idle and he also rounded the edges to make the whistling stop. He did it and guess what....it still idles like crap and the whistling is still there. Now the damn thing fluctuates when I start her and is having a tough time finding the idle. I also noticed that the timing mark disappeared when I plugged the SPOUT plug in. I wonder why?
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