Oldsmobile 400 425 455 Dual Idler Noisey Timing Gear Drive Set Pop-Off plates are designed to

Pop-Off plates are designed to release the high pressure that builds up inside of the engine to prevent damaging or cracking your supercharger components

4340 chromoly H-beam connecting rods

most notably the cylinder heads

These Speedmaster filters are washable and reusable

These standard-depth transmission pans from Speedmaster are quality replacement for your pan

Oldsmobile 400 425 455 Dual Idler Noisey Timing Gear Drive Set Pop-Off plates are designed toSpeedmaster gear drives are great for you folks who want better timing. Their dual idler design has CNC machined components and they are easy to install. These drives fit under your stock timing cover and come complete with instructions. Minor machining may be required on some applications.