DZ Spark Plugs?

[YENKO DEUCE REGISTRY]

I use R45's for the street and cruising, but re-install R43's for SCR racing - remember the spark plug delivery to the meet-n-greet in the parking lot by the local Chevy dealer?

I have fouled several sets of R43's, (not my NOS set of 4 thin lined ones though), and found that the hotter R45 worked much better. I will give the NGK's a try though, as the R45's will foul occasionally too, especially after idling in line at a cruise or a show.

[budnate]

NGK's trick is to find them for a couple bucks a plug..we used to get them from Al's for about what Rick picked his up for then Chucks bought them out...now there back up to 5 to 8 bucks a plug...we need to find a online place to get them priced fairly...throttle response with them is usually real good.

[DarrenX33]

NGK appears to have a million different indentifiers for their plugs. How the heck did you decode UR5 for your L78. My car decodes to B6S for an R44. With the middle number being the heat range 5-6-7. 6 being middle. replacement.

[JoeG]

Rob had mentioned these... web page

[Salvatore]

Are NGK that much better than the Autolites? Whats the # for the 69 Z's? Thanks, Sam

[JoeG]

Sam --Rob did performance comparison tests on the dyno and he said he saw the difference with the NGK's performance.I've got an electronic ignition so I can open the gap or file back the ground rod a bit and my unit will fire pretty hot.----- I've got no complains with AC, BUT dynos don't lie, Rob said it performed super. I did however find that the AC 44 or 45 did keep a "STREET TUNE" longer than the NGK IN MY CASE-- also AC 43 is a little too cold if your not gonna blow out the carbon now and again....----------I would guess Rob would be able to give you a number for your Z............

[Salvatore]

Thanks Joe. I am thinking about using some of my NOS AC 44's for the street. (AC's look better) I have been using Autolites with good results. Maybe the NGK's are even better??!! Need to get the right heat range for the NGK. Thanks!