body ?

[0007]

how does everyone build the slope in the roofs on a modified

[Racer111]

If your asking how to bend it.Its a sheet metal crimping tool.You only need to slightly slope the front 4 inches or so and rest back flat..

[dirtmod21]

The way i have always done this is by breaking the driver side and passenger side to approx 45 degree angle. What gives you the curve is by using a crimping tool. As you crimp the bent edge, it will give you a radius.

http://eastwesthydro.com/garden-supplies/hand-tools/midwest/midwest-crimping-tool-5-blade-700840

This something similar that i use. It has three blades on one and two on the other side.

I hope this helps

[JustAddDirt]

roof

I build a flat roof. more downforce. and since they allow 3" of rake, it really adds downforce.

[0007]

what gauge aluminum is to light

[traviskoehler]

Aluminum

0.032 is very flimsy. Most use 0.040.

Travis

[MM90]

Curved roofs are better with spoilers, it directs the air to the spoiler better.

[racer69]

MM90 is right.

[JustAddDirt]

air

Curved roofs are better with spoilers, it directs the air to the spoiler better.

Their is no way that air from the roof gets down to the spoiler with enough force to do anything. the spoiler gets its air off the deck. If you have that much curve in your roof, you are creating lift, or alot of turbulant air that will not produce downforce.
If you had a front window, and a rear window yes, but not with a tunneled body.

[Flyin Iowan]

theres a very good article either in circle track or dirt modified magazine i cant remember which right now that kyle strickler did about bodies. I would read it. Maybe someone on here can link to it, im at work otherwise i could tell you what to look for.