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Same as you normally would in any other car, depends on the spark plugs.
.040
its broken
Remove the spark plug wire caps from the spark plugs. Remove the spark plugs by turning them to the left with a 5/8 deep well socket.
Put the IROC up on jack stands and remove the spark plugs from under the engine.
Screwed into the head.
Not to be disrespectful, however you just answered your own question...if it's a V-6, there are 6 spark plugs!
If it's electronic ignition the plug gap should be 1.1mm you buy spark plugs already sized (NGK BP5ES-11) It depends on what type of spark plugs you are using. For conventional plugs the gap of 1.0 - 1.1 mm (0.039 to 43") is correct. If you are running Platinum plugs, I like to gap at 0.005" extra (0.44 - 0.048"). I get good performance with NGK 7082 Platinum. Cheers Malcolm
Ngk BR9ES
6.
The spark plugs on a 1988 model, 70hp Johnson outboard, should be gapped to .030in.