[Steve91T]

So now that I've decied to convert my LT1 front end to an LS1 front end, I've been thinking a lot about making it a front breather.

Why don't more people do it? Seems like a little trimming of the Impact foam and bumper beam and you could duct air directly to the radiator instead of scooping it from the bottom. The openings in the bumper are about 70 sq inches combined. Seems like it would be plenty for the radiator.

Seems like it would be a more efficient design and create less lift at speed.

For those who have done it, how does it preform?

[Steve91T]

So using the openings in the bumper that will allow for a straight shot the radiator won't work without an air dam? I would think that would be a more efficient way to get air to the radiator than scooping it from the bottom.

Not doubting you, just want to learn more about the aerodynamic differences between the two set ups.

[Blainefab]

So using the openings in the bumper that will allow for a straight shot the radiator won't work without an air dam? I would think that would be a more efficient way to get air to the radiator than scooping it from the bottom.

Not doubting you, just want to learn more about the aerodynamic differences between the two set ups.

Short answer is yes - just cutting a hole thru the front is not likely to work. Long answer is it depends - where and how you are using it, what the ambient conditions are, how well the opening is sealed, etc.

Consider what's happening with the OEM intake - look at the area the the air deflector is operating against, and how the intake duct shapes the flow up onto the front of the radiator. There is more effective area than what you have available in the grille area of the LS1 bumper cover. You can effectively increase the area by raising the local pressure with a dam, but it would take some experimenting to make it work without limiting your ground clearance.