UCS Performance assembled the first "built" 3.5L for the 3G community with the help of Russ from Tearstone for the CP pistons. The 3.5L is definitely a more stout engine than the 3.0L. While it cannot rev as high as the 3.0L due to the piston to stroke ratio, it definitely makes more power down low. Due to certain parts being necessary for this swap, we offer this as a no core engine swap. You will receive a fully assembled 3.5L shortblock with all the parts necessary to swap your heads onto this engine. This includes lower intake manifold, upper intake manifold, and all required bracketry. You will not need to send me your old engine back as it's included in the price.