Plugs and parts

[Fish mojo]

What spark plugs and gap work best on a 91 4.3 2bbl, Thunderbolt ign. I went to buy some today and got 3 different recommendations. Also, what engine oil?

 

[Don S]

Re: Plugs and parts

Merc calls out the BR6FS plug from NGK. .035 Gap.<br /><br />Mercruiser Oil Recommendation<br /><br />