Bernhard

What makes a stroker piston?
Some venders advertize stroker pistons for the small block Olds,so is it that they are a larger than standard over bore with the olds pin size?

olds 307 and 403

All the ones I have seen have had the .927" sbc pin. Remember, the stroke is achieved using 2" or Honda rod journal. The CP ones are 4.125" bore.

Bernhard

They use Chevy and Honda rods by the looks of it more are using the chevy rod jounal size.

krooser

A stroker piston relocates the pin height to accommodate the longer stroke of a modified crankshaft. Without changing the pin height the piston would stick out of the bore.

joe_padavano

Just so we're all clear, the term "stroker piston" is a misnomer. Stroking a motor involves changing the stroke on the crankshaft, which has nothing to do with the piston directly. Changing the stroke while keeping the deck height of the block fixed requires changing either the rod length or the piston compression height (the dimension from the piston pin to the top of the piston) to keep the piston within the deck height of the block. Depending on the rod length used, you may or may not require different pistons to stroke a motor. Note that the longer stroke also pulls the piston further down in the cylinder at the bottom of the stroke, so the pistons may also require tailoring of the bottom of the skirt to clear the crank balance weights.

Bernhard

Thanks for the reply that helps a lot.