Oldsmobile 350 400 403 425 455 Flat Guide Plates (3/8" Pushrod - 7/16" S/H 1Pc.) and include a mounting bracket

and include a mounting bracket

Try using Speedmaster steel crankshaft pulleys to increase horsepower and reduce accessory drag

These manifolds require a universal 4-barrel throttle body

circuit racing and made to withstand extreme use

Speedmaster arm stud kits are made of 4140 Chromoly steel

Oldsmobile 350 400 403 425 455 Flat Guide Plates (3/8" Pushrod - 7/16" S/H 1Pc.) and include a mounting bracketYou 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.