SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: 702Stunna on July 21, 2020, 09:55:27 PM

Title: Spark plugs
Post by: 702Stunna on July 21, 2020, 09:55:27 PM

Got a 460, with a MSD ignition coil and distributor, and a holly 750, it’s been a while since I’ve had a jet boat so I forgot my gap, asking around I was told anywhere from .03 to .05, .05 seems a little extreme, I read that Motorcraft was the original OEM plug for this motor and was replaced by autolite, called autolite and they said that I should use 26’s according to their charts, can anyone recommend where I should set my gap at? Any information would be greatly appreciated!

Title: Re: Spark plugs
Post by: 427 wilder on July 22, 2020, 03:40:43 PM

Msd has a chart for a starting point using a msd box. 


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Title: Re: Spark plugs
Post by: 96Laveycraft21Xt on July 23, 2020, 11:30:07 AM

assuming it a regular pump gas motor, no blower etc. i would say just go .040.  no need to go crazy.