My slave cylinder does not have a bleed screw. My friend is telling me to loosen the allen screw to bleed. Manufacturer website says to fill with fluid and then pump push rod 10-15 times or until no bubbles rise in the master reservoir.

I am thinking the manufacturer is probably the better way. Correct?

The oem slave cylinders on the four speeds dont have bleeder valves, but most aftermarket ones do. Ford bleeding, what I've done in the past is filled up the slave cylinder with fluid and made sure that there was no air by holding it at an angle where the hose inlet is at the highest point possible, and lightly tapped the cylinder with a hammer to help the bubbles make their way out. and to bleed the rest of the system, just let the fluid run through until you get a solid stream. and if you can buy a handheld vacuum pump, it makes things VERY easy.
And just as a heads up, do not push the clutch petal when the slave cylinder is not mounted in place on the transmission, it will break.

Thanks. About to go give that a try.

Thanks for heads up! I will make sure that I wont push clutch without slave attached back on transmission. But just to be clear..what will break? The clutch petal? The transmission? The slave cylinder?

The slave piston will break through the slave housing because it will already be at the end of the slave cylinder when you press the pedal.