No spec has 5 degree of camber or total 5 degree camber it would always be a error.

Not sure where you are seeing these specs, never found 1 site that has 5 degree for camber. I think someone might be using the wrong term and using camber to mean caster.

On a street setup having 1 degree of camber is a lot.

 

I think what you are reading as 5° camber is actually .5° camber.

 

I'm thinking the same. .5 degrees, not 5 degrees. My front wheels are currently set at .4 degrees. and if one looks closely, it's noticeable that the top of the tires are tipped in. can't imagine 5 degrees on a street car. You'd look like one of those kids that lower there ricer cars.

 

Kidvette has excellent diagrams above. Chevy's old pos camber spec is for outdated skinny bias ply tires. For modern wider radials you want to pay a lot of attention to the camber. For street 0 to 0.5 degree negative is good. For autocross 0.5 to 0.75 degrees is good. 1.0 neg should be reserved for 100% racers. I literally use an Android Phone app called "clinometer" that works excellent for this.

The caster (rearward tilt) is another matter. GM Manual steer specs are 0 to 1 pos (backward) you probably want much more. ( As much as you can get within your modification limitations) A stock car (ps model) you can probably get 2.5 or so before you run out of adjustment. (It needs to be the same or very close from right to left). Moog offset upper arms will help you gain maybe another 1.5. Slotting the mounting holes .025" can gain you another 1.5 and still look almost stock. Installing Global West upper arms and shafts or Van Steel Arms both have a little different ball joint mounting location geometry and advertise easy caster adjustment in the 5-6 degree range.

It is trickier to measure than camber but Cargotzman has an excellent write-up above.

More caster increases steering wheel feedback and makes the car more calm & stable on the highway with better straight-line returnability. No modern car runs 0 caster anymore, not since PS and radials became common in the 70s. The C3 was one of the last hold-outs with 1963 manual steer chassis geometry built-in to it.