11. Because of the taller bodies of the roller lifters, we had to switch to shorter length pushrods. Combined with the raised valvetrain height of our Trick Flow heads, stock length big-block pushrods ended up being just right. If you’re using stock heads, you’ll definitely need shorter pushrods, so plan on getting a checking pushrod to determine what length you’ll need. We also took this opportunity to upgrade to a set of Trick Flow 1.7 ratio aluminum full roller rockers, which also required us to install taller valve covers.