Spark Plug Gap (easy question I think)

[Dinows]

I bought 8 new NGK Plugs number BR6FS for my 1988 v8 350 mercruiser. The guy at the marina looked in the book and said .40 for the gap. When I pulled out the old ones (same plug) they were all at .30 can anyone tell me what is correct ?

Thanks in advance

 

[Bondo]

Re: Spark Plug Gap (easy question I think)

Ayuh,... I'd have guessed .035,... .040 sounds reasonable...

 

[TiredoleBoy]

Re: Spark Plug Gap (easy question I think)

Bond O is correct it is a .035 gap for this engine. As a matter all of the gaps are at this for all engine sizes according to the shop manual.
The plugs they call for are ac MR 43T's.

 

[Dinows]

Re: Spark Plug Gap (easy question I think)

Thanks so much for your help, I will pull them and re-do at .35