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D17 Gas 4 Cyl. Hotter Spark Plugs.

E

eye4iron

Member
What is a good recommended hotter spark plug for a D17 gas 4 cyl..? I have one plug that will oil foul about once a year. I believe I can pull the valve cover at a latter date and install some valve guide seals to limit the oil fouling.
But until then I would like to run a hotter plug. Any suggestions or advice.
 
AC Delco R46 or R47 for the 3/8" length and AC Delco R46XL or R46XLS or R47XL or R47XLS for the 3/4" length.
 
Thanks for the replies.
They are the 3/4? reach.
Dr. Allis. Are those plug numbers stock or a hotter range.
 
Don't know About the "stock" number, but have learned that the smaller the number, the hotter the plug.
 
(quoted from post at 17:08:07 02/11/19) Don't know About the "stock" number, but have learned that the smaller the number, the hotter the plug.
Click to expand...
Well, that isn't the case with AC Delco plugs. 45XL is stock. 46-47-48's are all HOTTER.
 
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