SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: Mx574 on December 13, 2021, 05:55:45 PM

Title: Spark plug recommendations
Post by: Mx574 on December 13, 2021, 05:55:45 PM

Just got my 454 rebuilt.
Went from flat tappet cam to hydraulic roller. And went from peanut heads to 702 heads.
So my old plugs won't work. Looking for recommendations on what plugs to run. Motor is in a 21 foot open bow.
Thanks in advance

Title: Re: Spark plug recommendations
Post by: mash on it on December 13, 2021, 08:39:29 PM

Probably (AC) R44 or the heat range of your choice.

Dan'l

Title: Re: Spark plug recommendations
Post by: 96Laveycraft21Xt on December 16, 2021, 01:53:59 PM

Quote from: Mx574 on December 13, 2021, 05:55:45 PM

Just got my 454 rebuilt.
Went from flat tappet cam to hydraulic roller. And went from peanut heads to 702 heads.
So my old plugs won't work. Looking for recommendations on what plugs to run. Motor is in a 21 foot open bow.
Thanks in advance

Curious how the closed chamber heads run compared to the peanut ports?! be sure to let us know.

so.....what are doing with the old heads?

Title: Re: Spark plug recommendations
Post by: Mx574 on December 17, 2021, 01:40:35 PM

I will let you know.
I don't have specs but the 702's got a little work done to them. Bigger valves than came stock in 702 at the least. I just handed them over to the builder. Don't know if he will reuse them or not

Title: Re: Spark plug recommendations
Post by: Mx574 on December 17, 2021, 01:48:59 PM

On a Chevelle forum they recommended so I picked up ac Delco
R44XLS plugs