What is the position of the distributor at dead top centre on a 1986 Chevy silverado?
If #1 piston is up on compression (hold finger over plug hole to feel air while bumping starter) put something in and rotate motor so you can tell when piston is at top of stroke. With cap off distributer rotor should point to #1 plug wire. rotate dist. with coil wire off turn over engine and move dist to get it to turn over the fastest. plug in coil wire start and time it.
the ht leads may not be nubered but the longest should be used for the furthest away sparkplug. if you need to fit them to the distributor cap, find the firing sequence of the vehicle, find when pison 1 is in top dead centre, then work from piston 1 on the distributor round in the order that the rotor turns, normally clockwise