5.7 mercruiser spark plug gap

[sea ray 245]

I have an 2001 5.7 EFI 260 hp that I had new wires ,cap with rotor and new AC Delco MR43LTS PLUGS . Boat seem to run better before parts were changed seemed smother and quicker. I ask the dealer who did the work what gap he used on plugs he said 0.045 and thats whats on flame arrestor cover . I have the old plugs and I check the gap and they were 0.035 would this make a difference . I just purchased this boat a few months ago so I had no idea when these parts were replaced so I thought I would start somewhat fresh. I heard the older 5.7 used 0.035 and the newer went to 0.045 . Love to hear what other boaters have to say. Thanks

 

[TilliamWe]

Re: 5.7 mercruiser spark plug gap

The difference is probably in your head. The .045 gap for MR43LTS is good. Don't over think it, just go boating.