Optimum intake runner size
 

What would be a good intake runner size of a 406 sbc that is a drag car only. I know there are lots of variables, i.e. cam, compression, etc. Just would like a ball park number. Thanks.

210 AFR

215 - 225 without knowing any of the variables.

Try to fill in as many variables as you can, the experience and knowledge lurking here could be of great benefit to the power level of your engine.