Gas Mileage???

I'll go you one better
Crank the engine over to put #6 piston on the compression stroke. Install a compression tester hose with the lower valve removed. Inject about 20 psi in there, to push the piston back down the way it came. Then reduce the pressure, while hand-cranking the piston up against the pressure. There will come a point when the intake valve closes, and pressure will no longer be heard hissing into the intake, and it will become difficult to raise the piston. Try to pinpoint this exact spot. When you get it, mark the damper next to the TDC mark. That is your Intake Closing Angle. It may not be exact, but if you are real careful it will be pretty close.
Now, finding the other end is impossible with the valve gear installed. But if you are serious, you will pop the entire rocker arm assembly off then reinstall number 6 intake rocker only,and go find it the same way. Simply turn the engine over backwards until the hissing stops and again find that exact spot and mark the damper next to the TDC mark.This is your intake opening angle. With a cloth tape or some flexible tape, measure the distance between the marks. Them measure the entire circumference of the damper. Or you can take a shortcut and take a diameter of the damper and just multiply that by 3.1416(Pi).
Now you do the math, Say you have a 7" damper which would be 22 inches around, and you measured 16.5 inches between the marks. Then 16.5/22 = 3/4 of a turn and since a full turn is 360 degrees, that makes your cam .75 x 360 =270 degrees on the intake. If you measured 17.6, then 17.6/22 x 360 =288*. With this number and the lift numbers, finding the cam in a catalog should be easy. Is it easier than degreeing it?heckYa. Is it faster? heckYa. Is it accurate? It can be pretty close, but it is only as accurate as the guy doing it, and it can be a little difficult with the fan in there, so I take it out. That thing has eaten enough of my skin for two lifetimes. It should get you pretty close cuz most cams are rated at .006 or .008 lift. and you are finding Zero lift. So this method should be a little more than advertised, but with errors, it might be right on. But even if you are off at each end by 1/16, that totals (2 x .0625)/22 x 360 = 2 degrees, and if your tape measure is off another 1/16, that could either reduce the error to 1* or increase it to 3 degrees. This is still less than one cam size.
You can actually use any cylinder to do this, but by using #6 or #1, I suppose you could also figure out the installed centerline, cuz you have a correct TDC mark.