Engine stripped down and rebuilt with new rings, ARP rod bolts, ARP head stud kit, new bid end bearings and -1mm off the head + low profile head gasket for increased compression. Other spec of the engine as it was in the Sierra was 2.1 with hepolite piston, ported and flowed head, three angle valves, Piper OHC134 high torque cam shaft, ecu chipped by Motorsport Devlopments, k+n induction kit and Janspeed 4-2-1 mainfold and exhaust system. Rolling roaded at 143bhp - should be 150bhp without power steering or viscous fan. 180bhp with throttle bodies I have lined up.