pcmhacking.net

http://www.4secondsflat.com/Spark_plug_reading.html thought this may help a few people with there tuning theorys ive tuned the vb and a lot of other cars using these principles seems to work good

nice find.

A Book my Dad has from the 70's has all that kind of stuff in detail big thick hard cover book, if im over there ill see if i can find it and perhaps scan some stuff in.

Good stuff, just be careful when reading older info as pre-unleaded fuel gives a bit different results on the plugs