That is true but not knowing what ignition system he has there is no way to 'guess' what plug gap to use... can start anywhere that gives spark, but is it correct?I've always checked mine but have found that more often than not they are really close to where I want them at .035 anyways.
I've used .035 for as long as I can remember and it's always been fine. Perfect? Heck, I don't know since I don't own an engine dyno to test it out. Could I make ___ more power if I opened them up, or tightened them down a few thousandths? Probably, but since I'm not looking for an extra hundredth of a second, or a fraction of a mile an hour at the track I really don't care.That is true but not knowing what ignition system he has there is no way to 'guess' what plug gap to use... can start anywhere that gives spark, but is it correct?
I might just do that next time! Although I have a set of Motorcraft platinum's with only a few miles on them (long story) that I should probably use next time I change them out. Since the car only gets a few hundred miles a year that could be a LONG time though!Use E3plugs and don't worry about it.
An Autolite 3926 is quite a hot plug--is that recommended for use with an aluminum block?Can someone give me a gap or guidelines for gapping plugs: 351W alum. block bored/stroked 4.125"/4.00", 427 c.i., aggressive cam, EFI, AFR 205cc alum. heads, tring to make a streetable daily driver, Autolite 3926 plugs.
Thanking everyone in advance, Adlai
+1. I just caught this thread and that jumped-out at me too. I would have started with 3923s and moved from there with testing. Hmmm...An Autolite 3926 is quite a hot plug--...
Anything will spark at .035, so that is safe to start with. Your final gap will depend not only on your ignition setup, but your engine and what the ignition must fire through. There is a thread around here on how to test and set your optimum gap. It is wise to tune your gap along with everything else that gets tuned.Typically a good place to start is .035".