I bought a set of mopar performance roller rockers. I wasn't thinking when bought them but all the boxes are marked ext left and rt. They are the same rockers for ext and intake. Thanks for the help.

What application?

I am a small block guy, but isn't the big-block stuff market left and rt?

Outside of that, are the rockers offset, if so and if they are small-block they may be the W2 rockers, or the earlier T/A stuff, although I didn't think MP every did those.

There should be 8 of one type and 8 of the other (rt and left). There is a difference in the offset as stock rockers have as well. If you look through a service manual etc, and take your time, you will see which way the offset goes when assembled correctly. Keep an eye on pushrods, that they line up. You will see some that get pretty close to intake runner casting. Look it over good before you button it up.

8 left and 8 right.The offset is different. Someone had a set for sale and the ext and int had different part numbers on the boxes. I don't want to buy more if i can use what i already have. Thanks for the help.

Big block rockers. 8 left and 8 right. Someone was selling a set of them and hade 4 different part numbers. I'm thinking left and right ext and int are the same. II dont want to buy more if i can use all of these. Paul

On a set of big block heads with stock valve layout the intake rocker for one cylinder will be the same as the exhaust for the cylinder next to it. So in reality, there is no "intake" or "exhaust" or "left" or "right", just two different part numbers.

That what i was thinking. Thanks for the help. Paul