spark plugs

scarborough

Greasemonkey
Sep 30, 2016
179
28
what spark plugs are best for a 71 olds 455 with a hei distributor, I read and article that you should use ac Delco r46sx I'm running Delco r45. its a daily driver, just wonder if I need to change them. will it make a different how perform.
 
Oct 14, 2008
7,235
113
Melville,Saskatchewan
NGK XR45 or XR5, one step colder.
 
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scarborough

Greasemonkey
Thread starter
Sep 30, 2016
179
28
what spark plugs are best for a 71 olds 455 with a hei distributor, I read and article that you should use ac Delco r46sx I'm running Delco r45. its a daily driver, just wonder if I need to change them. will it make a different how perform.
NGK XR45 or XR5, one
NGK XR45 or XR5, one step colder.
thanks for info. I may have to go with the NGK XR45. seem like the only place that has the AC Delco R46SX is eBay, and some of those look used are very old don't no if that makes a different. I'm not a big fan of buying parts off eBay
 
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