lol…idk where ur getting these figures about chuck. hes not even close to 18psi, and never has been. and he hasnt been dyno’d since last year on last years setup
VE = volumetric efficiency. basically, how efficient the engine is, meaning, how well its ability to pump air. thats all an engine is, an air pump. you raise VE with cubes, and good flowing heads and a properly speced cam, intake, so on and so forth