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Which ones? There a are a few different part numbers. They've got a big open chamber, a "340" chamber for domed pistons, and the closed chamber.If you're looking for quench, the closed cambered ones are what you want to use with a step dish piston.
I would like to see the combustion chamber. The Pistons my builder suggested to use with my j heads go up in to the head to fill in an area and get better quench, but if they wont work with aluminum heads (down the road) I would like to find a different piston. Thanks for the input.