section one is all one piece made up of 2 6x6's and 1 2x12 attached on top. Also 2 2x4's are attached on top to prevent wheel movement.
Section two is all one piece made up of 1 6x6 and 1 6x8 and attached to the top is a 2x12.
section 2 is notched to prevent section 1 from moving once it is placed on top.
Raise one end of the car and place section 1 under the wheels.
raise the opposite end and place section 1 under those wheels.
Raise the opposite end and remove section 1 and place on top of section 2 and put back underneath the wheels.
Raise the opposite end and repeat last step.
to let down, reverse the steps...
I copied this from someone else so I cant take credit. But I did learn DO NOT RAISE all the way and place the both sections under the wheels at once.
This causes problems with car movement and spacing issues with the jack.
Anyway this is how I do it because it provides the exact height I need to remove the engine and allow ample room to work underneath the car safely.