What is this called?

Are you looking for a solution to a problem you don't have?

agesilaus wrote:
There are a couple on Amazon at $99, now I know the name. One has good reviews and comes with all the hardware. I'm going to order one of those. Thanks for all the answers and especially the explanation of what it does.

JRscooby wrote:


Back in the day, we would put spacers between hinge and hood, to get a gap about half inch. That let a lot of heat get away from that 427, drop the temp much quicker after top the hill. Going up hill, grossing 110,000 was hard to hold enough speed for airflow.

agesilaus wrote:
OK what is that black plastic piece, under the bumper and which stretches all the way across the bottom front of the truck called? I have a F350. I thought it might be the dam but that doesn't not find the part. I looked thru the Rock Auto body part section but could not find one.

I wasn't too worried at first but it's loss actually exposes some rods and other parts plus I think it might affect mileage.

Any help is appreciated.

JIMNLIN wrote:
Our older trucks didn't have the front under the bumper air dam. Engineers found air flow under the engine bay wouldn't let hot air escape fast enough and was creating hot running engines when pulling a heavy trailer (example).

The air dam helps create low pressures under the engine bay which allows more air flow through the radiator ...over the engine and on out the bottom.
This was happening when I was towing for a living. Sooo... we made air dams for our older trucks or bought them from a dealer if our trucks had the same bumpers. Worked great on my 454 GM trucks. No more fried spark plug wires and no more hot starter motor/no crank issues.

Never noticed any mpg changes in that type of work. Just a steady 4-6 mpg on those old carbureted BB engines.

Newer trucks ?? Truck MFG engineers can give us the skinny on their use today.