Dave, the HIC is easily plugged off and typically not a problem as the valve is designed to only open when underhood temps reach a point where a leaner A/F ratio at idle is beneficial. A defective HIC valve could be open and cause a vacuum leak at idle, so it is something to check when troubleshooting idle problems.....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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