How often do you change your spark plugs?

[LaGrasta]

james, I can't say if they last longer as I put my Pertronix and plugs in together 10k ago. All are still great. I'd have to firgure they would last longer. Just the wider gap alone would increase life.

 

[matt1967]

how about 1 week and less than 1k miles. 2 times. Champion Copper Plus plugs was the problem. fouled the #6 plug 2 times and I'm 1 where if 1 needs changed, they all do. after 2 sets of the Champions and I got a set of Autolites, did foul the #6 plug but I was able to put it in the #3 spot after drying off and put the #3 plug in #6 and it runs fine and has been for a long time now

 

[BKNLINE]

I can't remember what my '65 Mustang owners manual (reproduction) stated for plug change but I have a recollection of 20 or 25K miles. I think that goes for points too. In my '65 289 V8 Mustang, I have 20K miles on the points and going. I've checked dwell and the point surfaces periodically and they're within spec. MPG is steady at 16. I changed the plugs about 10K miles ago, it's first set of plugs since I bought the car 35K miles ago.

I had a set of Autolite Copper Plus in my '78 302 Futura for 40K miles. They were way beyond service life because the center electrode was round.

I guess 40K is a bit much.

Dean T

 

[woodbutcher]

Most generally,I change my plugs,wires,rotor,cap and coolant every Spring.Have been setting plug gap at .045 for years.Ever since I converted the 74 F100 that I had to DS2.Never had any problems.When GM first came out with their HEI set up a friend wanted to experiment with plug life.He went 150,000 mi on the factory set before changing.Took 3 years only,as he had a sales route all over Florida and South Georgia.
Leo

 

[x21]

I think thats one of the advantages i miss about not having the 6 as my daily driver- the ease of getting to all the plugs. The 302/5.0 motor has those last couple of plugs that are facing towards the firewall, so you need to work a little magic to get them in/out.
I went and tried those bosche platinum +4s. For the most part, i felt like i just blew $6/plug. I never noticed any difference in performance. However I have had these plugs for over 2-3 years now.