Mustang Forum

Technical & General Discussion Area => Tech Torque Pre 1973 => Topic started by: Coupe66 on January 07, 2018, 07:08:14 PM

Title: Spark plugs
Post by: Coupe66 on January 07, 2018, 07:08:14 PM
Hi guys,

Probably been spoken about many times , but I would like advice for the best spark plugs for my 347.
The engine has AFR 185 heads , with close to 11:1 compression.
Currently I am running Champion RC10YX4 plugs which were recommended to me ???, but I would like to try something else?
I have searched some previous discussions and it looks like NGK are the go.
Which NGK's should I go for?
The car only gets driven once a week and I go to the drags and lakeside track meets on occasion.
Thanks,
Wes..
Title: Re: Spark plugs
Post by: GLENN 70 on January 07, 2018, 08:05:57 PM
Do a cross reference , BKR5E-11 . I would go a BKR6 E then re gap them to what you want .msd ?
Title: Re: Spark plugs
Post by: Coupe66 on January 07, 2018, 08:28:50 PM
Thanks Glenn,
BKR6E is what I was thinking also.
Yes, I do have MSD ignition.
Should I gap them at 0.040 ?
Title: Re: Spark plugs
Post by: Husky65 on January 07, 2018, 10:21:57 PM
Not to insult your intelligence, but the dash number after the plug number is the gap in mm. So if you are going to buy them and gap them to 0.040, just get the BKR6E-11, which are 1.1mm gap, or 0.043"

Title: Re: Spark plugs
Post by: skinner36 on January 07, 2018, 11:10:10 PM
Not to insult your intelligence, but the dash number after the plug number is the gap in mm. So if you are going to buy them and gap them to 0.040, just get the BKR6E-11, which are 1.1mm gap, or 0.043"

I never knew that. I pick up so many little bits and pieces from this forum
Title: Re: Spark plugs
Post by: GLENN 70 on January 08, 2018, 09:34:52 AM
Yes start with the dash 11 plugs and gap them to 45 and see what happens .. The higher comp ratio the smaller plug gap you go .  MSD say about 45-55 tho for over 10.5 and higher for lower comp engines . Look up MSD plug caps to make sure I'm correct .  Without a dyno who knows what's going on .
Title: Re: Spark plugs
Post by: Coupe66 on January 08, 2018, 11:47:09 AM
Cheers, thanks for that.
I will pick some up this week.  :thumb: