BMP 063030 - Intake Manifold Chevy Big Block 9.800" 4150 Carb FlangeBill Mitchell Products Intake Manifold Chevy Big Block 063030 9. 800" 4150 Carb Flange In addition to out powering the competition, its important to note that the single plane manifolds are designed to operate most efficiently in the 2500 to 7500 RPM range yet still maintain excellent low end throttle response. They are also equipped with bosses to accommodate installing nitrous oxide port nozzles. We also offer a BMP intake manifold for marine