GM TH400 Racing Heavy Duty Transmission Input Shaft & Aluminum Forward Drum Every Speedmaster flexplate will withstand

Every Speedmaster flexplate will withstand the extreme power and rpm of your performance application

and stress that the planetary gearset is subject to

an internal inertia ring

this intake manifold is built to withstand the demands of supercharged or turbocharged setups

to save you the expense of buying a different manifold or carburetor

GM TH400 Racing Heavy Duty Transmission Input Shaft & Aluminum Forward Drum Every Speedmaster flexplate will withstandTurbo 400 Billet Aluminum Forward Drum & Billet Input Shaft (with Modified Lube Circuit) The torque converter lube holes have been removed from the shaft to deliver superior strength.