TDC of the firing stroke..The piston is at TDC twice with the #1 spark plug removed, put your finger over the hole as you turn the motor over and when you feel the air being pushed out you are at TDC on the firing stroke. You could remove the valve cover also and check for clearance with the #1 rocker arms to see.
Good luck
Jeff S.


It's all good!
83 Shortbed stepside lots of mods
82 Shortbed fully restored
85 Shortbed daily driver
88 4-runner-Wife's daily driver