Buy it drop it in. these are pre built using all new blocks and heads These Tomei motors ar eone of the most sort after units on the market due to ready to drop in. This unit is a 2.3L with the following :Fully built Tomei head using all Tomei componets : fully built bottom end using forged pistons and rods and a 2.3 L crank :baffled sump and slicing baffle plate is also supplied : and the show stopper the Tomei Rocker cover which is numbered and comes complete with a fully spec sheet of your motor and is signed by off by one of Tomei top engine builders.