We do this on the Dragster, but it won't make much difference on a OHC motor, or a hemi, where the plug is pointed straight down at the top of the piston. On a old school OHV motor, where the plug comes in at and angle, you want to point the opening down towards the top of the piston for the best swirl action in the flame. But with high swirl heads, more than 2 valves, and the plug aimed straight down, indexing them won't make enough of a difference to be worth the time. You'll get more gain from taking a **** before driving.
It would prolly make a difference on the 3.0 and the 4.0 OHV motors though, so I'm not saying it won't work, cause it will, I'm just saying it won't do anything for certain motors.
Originally Posted by TheStig88
i have more than 2 teeth and i don't screw the livestock...
I DON'T KNOW CHEVYS!