340 build .30 over

Yes i have a set of 318 already, whats the pros and cons of the 273 rockers, I heard they are heavier than the 318 rockers, but adustable, what gains will i get from a 273 rocker rather than a 318.

They are relatively cheap rugged as heck and are adjustable. I have used them in many diff 340s. Actually have them in my current 340. I hate to see a rocker break and ruin your otherwise awesome looking build. My buddy had a ton of money in his 410 and pretty near ruined it w the pro comp rockers. Luckily he shut it rite down and it was saved w a good cleaning, new bearings, and gasket set. Could have been much worse.