Oldsmobile 350 400 403 425 455 Flat Guide Plates (3/8" Pushrod - 7/16" S/H 1Pc.) Try using Speedmaster steel crankshaft

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

as well as keep them in line

ensuring a perfect fit and maximum efficiency

circuit racing and made to withstand extreme use

compact alternative to bulky transmission coolers

Oldsmobile 350 400 403 425 455 Flat Guide Plates (3/8" Pushrod - 7/16" S/H 1Pc.) Try using Speedmaster steel crankshaftYou 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.