Cross reference for AC R45TS

speedfreek · Jun 15, 2007

I need the "long shank" sparkplug that is the same as a R45TS. The idiots at the parts store cannot find it. Is this the right heat range for 10.5:1 CR?
If anyone is running NGK with this compression, what is the part num of your plugs. I might try NGK. thanks

67FamilyFun · Jun 15, 2007

I don't know if it's the right plug or not, but it cross references to two NGK numbers:
NGK stock number # 4762
NGK: UR4
and
NGK stock number # 2869
NGK :UR4GP

http://www.clubplug.net/cross.html

Scott

12run · Jun 15, 2007

If by "long shank" you mean longer threaded area or reach, you need R44LTS or Autolite 605. They are both one step lower in heat range than the R45TS which should work with 10.5:1 compression. R45TS has a reach of .460" and R44LTS has a reach of .708" All of these plugs have 14MM threads with tapered seats. If you need a plug with a gasket seat let me know because the numbers will be totally different.

Cross reference for AC R45TS

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