So once and for all I want to sort out what I should be using and setting for spark plugs. NS Parts and NAPA usually give me the wrong plugs for the V-8's first time around... but I'd like to stick with NAPA in the future. I have two 72 Comets - one 200 six and one 302 V-8. I'm not using Champion or Motorcraft. NGK V-power seems to be the standard in Canada and even though I always check - they never need gapping. Have used them on all my cars for 10 years. Anybody got a conversion chart for replacements in stock form? I know there's hot and cold variations - but for my car the stock plug has run great year round in Vancouver. I'm using NGK's WR5 1071 in both cars but not sure if it's the correct plug for the V-8, since this was recommended for the six. The car is running; but very rough. Also, both cars are now on Pertronix ignitions so once I sort out other issues I might need to look at (enlarging???) the gap. Can anybody take my hand and walk me through THEIR experiences before I start messing with gap and timing? I guess cross-references to different manufacturers would be awesome at this point... Thanks!
Autolites or Motorcraft only in my book. Using anything else makes it run strange. NGK's are great in my (now my moms) Corolla. What's the beef with the factory recomended plug? Not all cars like the same plugs. Sorry for not answering your question.
I always run Motorcraft or Autolites for the same reason. Just the cheapest plain jane plugs seem to run the best in my Fords. As far as opening the gap you only need to do that in my opinion if you run a hotter coil which will support a larger gap. clint
Well as a driveablity tech in a dealer I'd say I have quite a bit of spark plug experience. I've seen all kinds of different brands of plugs and all kinds of applications. By far the least amount of problems are always the factory plug. I love it when they come in for a misfire fault and they have brand new Bosch platinums with the 4 electrodes. They seem to popular up here. Thanks to Crappy Tire. Put the factory Champions in and its all better. Seen it numerous times. A few of our Chryslers run NGK factory and they do very well. All of our techs use the factory plugs in there vehicles. Dont have experience with race apps. and MSD etc. Maybe someone else can chime in on that one. If we get a non Chrysler product in we order plugs in from the dealer or Delco whatever.
I prefer the Autolites over the Champions. They always seem to last longer in my Fords. I've had good luck with the NGK's as well.
I agree. I also have done hundreds of plugs as a tech. The NGK being factory must be something that has come sonce I got out. I never worked at Chrysler but I did work for Ford and Toyota. Most of my years were at Pep Bums tho. This is what I learned as a general rule of experience: Ford= Motorcraft, Autolite Chrysler= Champion Toyota= NGK Chevy= AC Delco There may be others but I may have gone way off topic and it's time to go to church. Wifes rushing me
Just one word of caution on the NGK's. In my experience and that of others I know, they are good plugs but get 'em wet and they're done. I run Autolite platinums. Not because I subscribe to all the hype about platinum plugs, but because (hopefully) they'll last a long time. 'Cause I hate changing plugs on my car!
