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#1
04-09-2008, 06:24 PM
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Re: NGK vs. AC Delco spark plugs
My XR5's don't hit the pistons, and they work great!!
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Marlin 70 Yenko Nova-350/360, 4speed M21, 4.10 Posi (Daddy's Ride) 69 SS Nova-396/375hp, 4speed M20, 3.55 Posi (Benjamin's Ride) 67 RS Camaro-327/250hp, 2speed Glide, & 3.08 Open (Danny's Ride) 
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#2
04-09-2008, 07:08 PM
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Re: NGK vs. AC Delco spark plugs
Do you run the XR5'S on the street or a heat range higher? I use R44S what would the NGK number be to that? Thanks!
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#3
04-10-2008, 12:53 AM
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Re: NGK vs. AC Delco spark plugs
Sam...I think the next heat range up is the XR4 for NGK. They are just the opposite of AC Delco...Delco the higher the number, the hotter the plug...NGK the lower the number. the hotter the plug.
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 1970Camaro Z28
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#4
05-13-2008, 10:29 AM
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Re: NGK vs. AC Delco spark plugs
Month+ old thread, I know....
My 70Z is a ~58K mile, original-build engine. Ran great for the last ten years with R45S, then switched over to 43s about a year ago. It doesnt care for those too much. Thinking of putting some XR5s in it based on all the good reports, along with a new set of points which are probably 10 years old. Think the XR5s would be the correct plug, or should I step up/down a heat range considering it's never been rebuilt? It'll still 4-wheel slide  , but isnt quite right at WOT 
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