600-650HP LBZ Build - Misc Questions - I'm a Virgin!

[Fingers]

They definitely are not an efficient design.

Based on?

 

[Fingers]

Concentrate on the bottom end. Crank, rods, pistons, and cam. Everything else is more or less bolt on after the fact and can be done over time as money allows. Turbo being the biggest improvement for HP, then fuel system.

Nothing spoils your enjoyment of a truck more than breaking down.