Hi, I have a 1988 k1500 with the 350 TBI. When I got it the air duct inside the passengers side fender had come unattached and wasn't connected at the end behind the indicator light anymore, so I did away with the ducting that runs between the air filter housing and the fender. I have seen in chatter on here about cold air intakes and there benefit, or not, so when I took the plastic duct out of my fender today I took some pictures of it and measured the cross section for anyone who may be interested. The small opening where it does a tight right angle behind the battery box measure only 21 cm2 or 3.25 inches2 so not a big opening. I have read that these were only in the earlier trucks and done away with later on and I am not surprised as it appears quite restrictive.
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