Put em in, they work! Went up from a .028 gap at 18-20 psi to a .035 gap - no blowout. Gonna try larger next time I change the plugs! Hearty 2 thumbs up from me for less than 200 bucks. Mounted them like an ass though, can someone please send me pics of their mounting. I searched and the old posts no longer have pic links that work.