Our block is a water block. Max bore size is 4.080 and we're currently at 4.060. Should last a long time if it doesn't get any damage but it won't be capable of very many rebuilds.

A larger bore size would've made more power but that wasn't really an option at the time. Also, I wasn't too sure if the siamesed block would work for our application. I didn't really want to get a ton of money invested into the motor and then fight cooling problems at the track.