Nissan/Datsun Skyline R30 (South Africa) LZ (competition) The "LZ" twin cam head was designed to give a power boost to the Datsun L series engine for competition purposes. There are two different LZ cylinder heads. The early head is the same thickness as a normal L series head. The engine using the first head was referred to as the L14 twin cam. There was no mention of Z in the title. This L14 twin cam head engine has flat exit side exhaust ports, the early 12 bolt rocker cover and the coolant discharge on the inlet side of the head. All early twin cam engines appear to have the 14 bolt rocker cover (6 for the cover and 8 for the bolt-in plug holders). Later engines use the full flat cover with six bolts to secure it. The LZ engine was built purely for Datsun/Nissan competition use. Engine size can vary between 1400 cc (LZ14) in the PB110 "1200", 1600 cc in the PB210, 1800 CC in the 710 2.0 litres in the PA10 Stanza, to 2.2 liter in the 910 bluebird rally cars. The naturally aspirated LZ engines used Solex carburettors depending on capacity. The LZ engine found its way into many categories, from "Datsun Works" rally cars, Formula Pacific, Group 4 (racing), Group 5 (racing) and Group C. In some Japanese racing classes the LZ engine is fitted with low compression pistons and a "T05B" turbocharger. These engines are electronically fuel injected. A very successful example of the LZ turbo was in the famous Japanese "White Lightning" Silvia and "Tomica" R30 Skyline, both driven by Hoshino in the mid 1980s. The LZ turbo engine was also used in the 1986 Nissan March 85G Le Mans car. The LZ turbo engine was tuned to produce at 7,600 rpm and at 6,400 rpm. The original LZ20B turbo engine used in the 1983 Nissan Silvia (S12) "White Lightning" Group 5 race car, produced at 8,000 rpm. The LZ14 engine for the Formula Pacific race cars produces at 10,200 rpm. For qualifying and non endurance events the LZ14 can be tweaked to produce at 11,000 rpm. The LZ14 is naturally aspirated and has a bore and stroke of . The LZ engine uses a standard L series engine block to mount the DOHC cylinder head. Usually the bottom end is dry sumped using a Tsubakimoto dry sump pump. The crankshaft used is