The Buick GNX V6 is the same block as the earlier commodore VN to VR, engine codes known as the LD5 LN1 and L27 all shared the same block, BTW the LD5 was in the GNX, VN series1 had the LN1 and the L27 was VN11 through VR. The Series 11 V6 which we in Aus called the Ecotec is known as the L36...