I've done it on several of my cars. All you have to do is mark the plugs with magic marker so you know where they're facing. After a little trial and error you can get most real close to where you want them. I thought it was bunk for years but after taking the heads off several cars with the plugs still in and seeing the difference in color based on which way they were facing, I became a believer. Or you could buy some plugs that don't have a traditional electrode.

Les