Originally Posted by zipper06
I also run Autolite 3923 in my small blk. they are exteded tip, don't know if they will work with a b/blk, i have to index them with my 14 to 1 pistons, just a suggestion.
Zip.
Also a decent ext tip plug, last sunday a guy at the tracks with 565 18 degree big duke engine had a slight miss they'd been looking for. I looked it over for them, and tested a few things but I kept going back to the 3923 although a ext tip, still do have a miss issue in certain combos do to the difference in the stap on the plugs. I found a set of plugs, replaced them and he went on to 2 finals that day, miss free. Although big dukes are a different animal, I feel the strap on the 3923 can cause a issue vs the 3910, on certain combos. If I get some time, I'll shot a few pics to show the difference.
I'd index them and roll the engine over by hand and see if they hit, if not id give them a try.