Originally Posted by zipper06
Wooh !!, you can't use a .750 reach plug if you are inside the chamber @ .460, but you can still use and extended tip plug, but a short reach. This now becomes a whole new ball game. I don't personally have any heads that use the short reach heads, so i'll leave it to someone who does.
Zip.
I also do not have a head that uses a short reach, mine are all good with the ext tip. Like zip said you can not use the long reach plug, but will need a ext tip, and at that point my knowledge runs out with the plugs as I do not know which plug to suggest.