Looked up options for my Mercrusier 4.3 carb 190 Hp motor . It seemed it was a bit sluggish . I put thiese in and wow what a difference instant start and better acceleration and hole shot . They are gapped at .60 . What a difference in throttle response no bog vs regular platinum plugs that it came with . Crownline 21SS it woke the boat up . It now runs 48 Mph with full fuel 2 people and a 🐶. Pllus they have a $3 rebate online at A/C Delco .
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Gap was off (.050) as usual. Check/adjust before installing. Also use dielectric grease so the boots don't adhere to the plugs. Otherwise just standard AC Delco spark plugs.
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I’m happy with the purchase
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Got my 2003 buick century back running smooth
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If you own a GM vehicle this is what belongs in it. AcDelco Iridium spark plugs gets you 100,000 miles +. The best money can buy.
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