GM TH400 Heavy Duty Racing Transmission Billet Aluminum Direct Drum Speedmaster cylinder head fasteners are

Speedmaster cylinder head fasteners are made from aircraft quality 8740 high tensile strength chromoly steel and cold-forged to ensure molecular integrity

and a plastic knob

loosening the converter and helping spool the turbo quickly

Speedmaster brake boosters are the perfect addition to your street rod or custom application

GM TH400 Heavy Duty Racing Transmission Billet Aluminum Direct Drum Speedmaster cylinder head fasteners areThis TH400 Billet Aluminum Direct Drum is manufactured specifically for drag racing but also makes a great replacement for the hard to find OEM parts. Drum weights 55% less than the OEM drum. Made from 7075 T6 Billet Aluminum, 36 element Pro Mod Sprag and new large steel outer race to allow the use of more clutches. Used in applications up to 3000 HP.