Shoot, once, I even stripped the bridges' sinks off an old motherboard with integrated gfx, cleaned off the thermal paste, and thermal taped them on the vrm's for cooling lol. It was about a 6 year old factory built computer with those small aluminum sinks on the n.b. and s.b. It actually worked well enough to get by until the enzotech copper sinks arrived!
I would just assume have the air going over them instead of doing all that work for temporary heat sinks.