Demand and Supply

My son has a Performance Engine Machine shop. He gets pistons for anything he is working on from his suppliers. No matter what engine you are working on you will need to have all the measurements to order the pistons.

Not just send me 318 pistons. You will also need to have the block prepped for those pistons. Each piston is fitted to the bore it is going in. There are times that sets of pistons have a different diameters between the 8 pistons for final fitment honing the cylinders. End gaps for the rings are also different per cylinder


Most new pistons have enough material to correct the valve relief for larger valves or cams. You can also correct compression with gasket thickness or cutting the deck.

My suggestion to you is to let the shop that is doing your block work order the pistons. Tell them the compression ratio you want and if they know what they are doing it shouldn't be an issue. They will need a head to do this.