This is a set of used 10:1 cast pistons, STD bore in good condition. They come with early style rods. I got them off ebay intending to do a cheap upgrade to a low compression 73 350. That motor ended up on my carb test stand so I no longer need these. Add these and a cam to your stock low compression 350 and youre in business. cheap power. Located in CT $125 shipped in the lower 48 USA