[american opel]

I always try to jet with a br9.plug and slipping has little to do with slipping and not reving in 5-6

 

[american opel]

the lower the number the hotter the plug.a br8 is hotter than 9 and 7 hotter than 8.

You are correct Mike. It depends on the engine. I run an 8 in my 350 with 200lbs.

 

[american opel]

you always try to run the coldest plug you can..if it got hot outside and my jetting was perfect I will sometimes switch to a 8 due to it running rich in hot temps.

 

[american opel]

it happens fred.i get stuff twisted sometimes also.