Guest Lee_M Posted May 30, 2011 Share Posted May 30, 2011 found the following plugs that have 5/8" (16mm) hex, AND are stocked@ advance autochampion "ra8hc"@ napachampion "cha 810" $1.89ac-delco 41-810 or 41810 $5.39@ autozonechampion "810"+++the NGK and autolite both have an 18mm hex, and do not fit Link to comment Share on other sites More sharing options...
89TC-16V Posted June 3, 2011 Share Posted June 3, 2011 the ones in mine are a champion motorcycle plug. i think they were a whole 89cents each and what autozone had listed for it Link to comment Share on other sites More sharing options...
Reaper1 Posted June 4, 2011 Share Posted June 4, 2011 With some good technical knowledge about the spark plugs, it *should* be possible to spec out an NGK plug for the 16V heads. You need to know the hex size (known to be 16mm), the thread size and reach, resistor plug (pretty standard for all cars now days), projector or non projector tip and possibly the reach, heat range, and any special tip design (probably not an issue here). I'd venture to say that with a little bit of time and searching an NGK plug could be sourced easily. Link to comment Share on other sites More sharing options...
TheLanesinNY Posted June 4, 2011 Share Posted June 4, 2011 This may sound like an obvious answer but my early 89 16V lists on the Vehicle Emission Control Information label:RA8HCDCPR7EThe owners manual that was in the glove box (Which appears to be for a 90):RA8YC-Rich Link to comment Share on other sites More sharing options...
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