Hey, guys. I have a new box full of the OEM replacement NGK plugs for the VX and I was looking just to see what Bosch offered. I noticed it has two options for the Civic 92-95, in relation to Bosch +4 plugs. One is for VX only and the other is for non-VX Civics. Interesting. Did they finally catch on for the VX being picking about the spark plugs or what?
Source: PepBoys website under Spark Plugs vehicle guide.
I can get the NGK 4043s locally at Pep Boys of all places, for $8.86 including tax for all 4.
I pulled a plug from cylinder 1 yesterday, lot of black carbon around the threads near the base of the plug and relatively white along the bottom of the prong. Not yet 20,000 miles on these, but I've ran Amsoil's Power Foam twice and have done a lot of cleanup since owning the vehicle. I'll probably replace them short this time. Manual says 30,000 or 2 years, whichever comes first. I'm about 15 months/18,000 miles in on these.
I use the stock NGK's. I figure with lean burn, the NGK's are the ones that are designed specifically for it. I've had good luck with them. They burn clean as they should.
I've bought two or three sets at a time from different stores so I could index them. For the price, you could be 3 sets of NGK stock plugs and index yours too. (same price you'd pay for the Bosh's) Indexing seems to have some effect, albeit one that is hard to quantify. However, if it's good enough for the race community, it's good enough and worth it for me.
BTW: Mine look like a combindation of these two pictures, but with normal gap and not 'as bad', just similar. More like the first picture, very close, and as for the 2nd not so much but just the white bottom of the prong(prong isn't completely black with carbon on mine). Otherwise, only carbon fouled.
Here's a great article on spark plug indexing: http://www.fordmuscle.com/archives/2000/07/indexplugs/
The basic premise is that you want the arm of the ground (the gap of the plug) to be facing the valves, specifically the exhaust if you can get that close to it. Thus, there isn't anything "blocking" the spark from the fuel. Theoretically it is the reason that these 4 pin bosh plugs perform slightly (1-2% better) than stock plugs.
It sounds like your plugs look as they should. Mine look like all other plugs I've taken out/replaced with the exception of the fact that the VX plugs look just a little more white (more white extending further down the plug, not to the face you are talking about is black, mine is also black there) than "normal" cars. I contribute that to the lean burn and my incessant need to be in lean all the time that I can.
If you pull them again, take a few photos of them and post em' for all the gurus to chime in!