Oldsmobile 350 400 403 425 455 Flat Guide Plates (3/8" Pushrod - 7/16" S/H 1Pc.) Speedmaster arm stud kits are

Speedmaster arm stud kits are made of 4140 Chromoly steel

making it exceptionally lightweight

These Speedmaster supercharger manifolds are aluminum constructed and suitable for competition or street use

These MidAir Series Manifolds includes a 4150 Series 1200 CFM Billet Throttle Body

and have a black oxide corrosion-resistant finish

Oldsmobile 350 400 403 425 455 Flat Guide Plates (3/8" Pushrod - 7/16" S/H 1Pc.) Speedmaster arm stud kits areYou need guideplates to keep your pushrods from deflecting under high rpm conditions. That's just what our Speedmaster guideplate sets do, they are made from 5140 Chromoly steel, nitrided and black oxide coated for corrosion and wear resistance.