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i fixed mine by drilling an 1/8th inch hole through the IAC passage in the T/Body, similar to the stock T/Body, then re adjusting my IAC counts with the blade opening, and re adjusting my TPS
The BBK whistles because they leave casting flash in the IAC passage. I'm pretty sure the Edelbrock is the same throttle body as the BBK.
That aint no lie on the cast ,those peckerweeds need better quality control and I also had to have the cable throttle assembly welded, them fuggers were slipping from each other.
mine whistles at when excilerating<spell check no worky