Oldsmobile 350 flat top pistons12/25/2023 All of this makes the flat-top piston preferable for most performance engines, particularly those that don't use hemispherical combustion chambers. But this comes with a bit of a weight penalty versus a flat-top piston, so the dished piston is more suitable for large-displacement, low-rpm engines. Otherwise, you'd do better to run a smaller combustion chamber and move the combustion event down into the piston with a dish. About the only engines that really need dome pistons are those that use hemispherical combustion chambers in this case, the chamber roof is so high and peaked that you almost can't maintain a decent compression ratio without a dome piston head. oldsmobile 350, 68 over, gsx forged pistons (4.125 bore) 599.99 add to cart oldsmobile 350, 20 over, gsx forged pistons ( 4.080 ) and ring set 729.99 add to cart oldsmobile 350, 40 over, gsx forged pistons ( 4.100 ) and ring set 729.99 add to cart oldsmobile 350, 68 over, gsx forged pistons ( 4.125 ) and ring set 729. While domed pistons do offer a few benefits in terms of power expression via increased surface area, dished pistons can do the same thing with far less weight penalty. Consider domed pistons an item of last resort, to be used only if you've got a huge combustion chamber and desperately need the dome to increase compression to an acceptable level.
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