When I bought my heads, the blue instruction sheets said to use Autolite 3924s for sparkplugs.
If I remember correctly, an Autolite 3924 is one heat range colder than stock plugs.. and they were what I used when I had my nitrous on waaay back when.. with stock heads. So how come AFR reccommends one heat range colder for the AFR heads in a naturally aspirated setup? Shouldn't I be using 3925s? [I think thats the autolite equiv to stock heat range Motorcraft plugs].
I suppose its no big deal because i'm going to install the nitrous next weekend and I guess i'll just stay with the 3924s... But I just wondered why AFR reccommends them instead of stock heat range?
If I remember correctly, an Autolite 3924 is one heat range colder than stock plugs.. and they were what I used when I had my nitrous on waaay back when.. with stock heads. So how come AFR reccommends one heat range colder for the AFR heads in a naturally aspirated setup? Shouldn't I be using 3925s? [I think thats the autolite equiv to stock heat range Motorcraft plugs].
I suppose its no big deal because i'm going to install the nitrous next weekend and I guess i'll just stay with the 3924s... But I just wondered why AFR reccommends them instead of stock heat range?