Oldsmobile 350 400 403 425 455 Flat Guide Plates (3/8" Pushrod - 7/16" S/H 1Pc.) circuit racing and made to

circuit racing and made to withstand extreme use

is available in many front and rear axle applications including both solid axle and IFS / IRS configurations

These manifolds require a universal 4-barrel throttle body

Will work with any Speedmaster or Speedmaster bellhousing

and include a mounting bracket

Oldsmobile 350 400 403 425 455 Flat Guide Plates (3/8" Pushrod - 7/16" S/H 1Pc.) circuit racing and made toYou 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.