Listed in owners manual and under the hood on a placard.
There is no spark plug cap located on the 1993 Chevy Blazer. The spark plug gap for this vehicle varies depending on the type of spark plug that is used. The OEM spark plug gap for this year is 0.040.
http://autorepair.about.com/library/firing_orders/bl-fo-2695.htm which spark plug goes to spark plugs wire set for a Saturn sw 1994
the spark plug gap is .44
Yes, there are 4.