i've had 4 friends this summer come to me saying cars running bad and i found all 4 cars with these accel plugs in them.replaced with other plugs and fixed them.4 out of 4 cars with bad accel plugs;;;;not good in my book.
AUTOLITE OR NGK, the autolites are shorter than stock type plugs and the #'s start at autolite 129 -135 I believe,I used to use the 133 in my nitrous motor,now I use the NGK # 7's in my alcohol motor,Hope this helps