8-10K on those plugs ..
humm heavy deposit ,, a matter of perception i suppose .. not in my judgement
link to the Bosh Document on plugs .
http://www.boschautoparts.com/Techni...kPlugFaces.pdf
some of the gearheads think one needs to examine closely way down on the insulator to *properly* read a plug.. but thats TOP FUEL [ well i am running a little top fuel] i offer MFR .. advice ..
a wee bit erosion on these ,, they got dressed with a points file and set before restoring them to engine..
p1 & p1a is my #1 plug close and closer .. minimal erosion
heavy_ash is from reference of heavy deposit with noticeable erosion,, UNSAT
