Piston 455, Forged .040


SKU: PSTN455FF04010 Categories: , ,


A great performance set of 455 pistons. To be used in conjunction with steel H beam bronze bushed connecting rods or aluminum connecting rods. Manufactured right here in the United States. We added performance advantages in this design. We start with a 4032 forging which has addition silicon content which helps prevent expansion and enhances mechanical longevity due to design. A quiet running design. We also redesigned the ring grooves to accept a very common and versatile ring package that not only will allow the engines coolant system to run at lower operating temperatures, but it will also free up the drag in the cylinder bore. This ultimately increases mechanical reliability, torque and HP output. Increases of 28 to 33 HP are not uncommon with this piston set over that of a Speed Pro or TRW.  We also incorporate a “D” style dish design. This design significantly reduces any chance of detonation, as it forces the air/fuel into the pistons center so that combustion is significantly reduced in the quench area.  Four critical design changes to make the ultimate 455 Oldsmobile piston. This piston set includes 8 wrist pins and 8 forged .040 over pistons. Will accept a 1/16th, 1/16th, 3/16th ring package.

Compression ratio with factory cylinder heads such as C, D, F, H, E, J, G, Ga, K and Ka, along with the Edelbrock’s will be 10.0 to 1. calculated based upon a head gasket thickness of .045 and a .025 piston to deck.