These piston kits are for those who dont need a complete rebuild but need a higher quality set of pistons and rings than factory.
We have added the option to upgrade your pistons from the factory 9:1cr to the 10:1cr for only $25.00. This is a very easy, safe and reliable way to increase power. If you are rebuilding your 4.7L engine, there is no down side to stepping up to 10:1cr. Increased POWER and MPG increases should be expected.