1981 Chevy 305 will not crank have changed plugs wires timing is right what could be wrong?
Does it turn over?
Does it have spark?
Does it have fuel?
Does it have compression?
There is a mark on the timing chain cover behind the harmonic balancer(behind the crank pulley). The harmonic balancer also has a slot cut in it so that you can line the crank up with the mark on the timing cover. The mark on the timing cover should sit at the 2 o'clock position or the 12 o'clock position. My 96 Chevy 305 is at the 2 o'clock position.