I put a Z Head on my T and am wondering if Those of you who a running could answer some questions:
1.Do you run the regular plugs, Champ 25, Autolite 3095 etc. or other.
2. what do you use for plug gap?
3. Does timing stay the same, I am using a distributor ignition??
I use the Champion 25's in mine. Keep in mind not to over tighten, The aluminum will strip easy. No change in timing.
I use Bosch platinum, (don't have the number handy), as hot a plug as they make.
Gap, about .025/.030
Don't know what the timing is. I still use the spark lever, (with distributor), and adjust for the "sweet spot"
I used the new Champion X plugs and didn't think they run as well in my car as the Champion 25's. Tried some old Gambles Varcon plugs too. They ran OK for a while. Wish I had some original Champion X plugs to try, but no luck so far. You might want to try different gaps too in order to see what works best for you. I also always use high temp anti-seize compound on the plug threads.
When I switched from a Z-Head to a Prus Head and went through the whole ritual above. Finally settled on the Motorcraft plugs gapped at .030 as the best alternative for that in my case.
I am running 3 cars with distributors, z heads, 3095 plugs set at .035. One car has had this set up for 10 years. All run well, start easy on 6 or 12 volts. I do use anti seize on spark plugs and the two bolts at the water jacket. One head had to be "tweeked" slightly due to the aluminum piston hitting the edge of the head. Other than that, a good set up.
My Z head is drilled for 14 MM plugs. I had BAD experience with Autolite 62.
I LIKE Bosch 4003 or Bosch 4203. I believe one or the other has been discontinued so you might need to look on E-bay to find them.
For standard 1/2" thread I like Edison 14.
: ^ )
I run Champion X's. Gap at .030". I am running American Bosch Ign so may not be same spark dwell as u have but I run well. Do need to clean soot off plugs every 100 miles or so ..
I am using Motorcraft F II'S in my Z, Prius, and original heads, They work the best for me in all applications. Old original x's work second best. I have had a lot of problems with champ 25's. I almost changed my cars to distributors before I used F11's
Thanks for the help.