^^^ yes it may have a leak on the bottom side of the intake & I would think it'd be more likely to happen there than above cuz of the heat/agitation. I'v e thought about introducing it under the valley pan (BB) or under the intake (SB) but that might be dangerous with adding that much flammable agent. EDIT & up top be sure to shield the side of the carbwith a piece of cardboard or paper so the spray dont get sucked into the carb & give you a false positive