Spark Plugs

[BitingSnake]

This may be a dumb question but what is the reach of a spark plug? I dont know if this is another word for gap or what. Im trying to order some plugs from summit and and it has a couple different reaches for my car. There is .460 in. reach, .708 in. reach, and .807 in. reach. Any help is greatly appreciated. Thanks.

 

[go-stang5.0]

The reach is how far the electrode sticks into the combustion chamber when properly screwed in. Too much reach is BAD! as the plug will interfere with valve/piston movements. Too little reach and you may have incomplete/improper combustion. That said...I have no idea what the proper reach is. Good luck.

 

[blksn955.o]

A 1994 cobra with stock gt40 heads will use a NGK TR5 for a stock plug. One range colder is a TR6 and for 2 colder you need the irrid. plug that is like a TR7i or TRi7...or something.

Cross ref. that plug with other brands and you should be golden.

IMHO I would go with either a autolite or NGK plug.

 

[BitingSnake]

Thanks for the help guys. Much appreciated.