Buyinga second-hand unit can lead to many problems, the major disadvantage is that if in the unfortunate event that anything were to go wrong with it. Then the mechanic fitting the engine could blame the failing of the engine rather than his fitment error and the supplier of the engine may blame the fitment error of the mechanic rather than their goods leaving the customer in the middle with more expenses to pay to rectify the issue, or you can find yourself at a stale mate position causing long delays to get your vehicle back on the road. Thankfully this problem will never occurby having RR Rebuilds recondition your unit as there will be no confusion over the fitment of the engine nor the parts/engine because we have stripped and reassembly your whole engine from a bare block we warranty the whole lot!!!! The Fitment and engine!!!