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 This pressed-in plug by the...  This pressed-in plug by the factory has been known to pop off at high boost pressures, causing the coolant to spill out of the engine and cause some serious damage.  Hiro prepares the cylinder...  Hiro prepares the cylinder head with a full HKS Step Pro L kit, which includes valvesprings, retainers, lifters, and valve stem seals.  The engine we plan to build...  The engine we plan to build will develop plenty of horsepower but our emphasis is making power under the curve with a high-responding motor, which will play an important part in helping us to do well in the Castrol Syntec Top Shop Challenge.  Hiro says the factory RB26...  Hiro says the factory RB26 intake valve guides are notorious for failures in high-horsepower engines. When the guide fails, the valve drops and causes catastrophic engine failure. Hiro says if the car is stock or only running an increase in boost, the factory guides will work fine.  The valves are shimmed per...  The valves are shimmed per factory specs with intake gauged at 0.45mm and exhaust clearance at 0.38mm. As a minor hydraulic shim adjustment, some shops clearance the lash closer to create an increase in lift to save in cost.  SP Engineering recommends...  SP Engineering recommends using NGK spark plugs for any RB26 engine build. NGK plugs with a heat range of seven or eight are a good choice for those who have an engine with minor engine work or turbo upgrades. For drag racing applications SP Engineering recommends going with a nine- or 10-range plug and everyone should stay away from iridium and stick with platinum plugs. The more serious plug used in F1 Racing, World Rally Championship, and MotoGP is the NGK race plug, which lacks an electrode tip that would otherwise break off or melt from the severity of the engine. These are the highest-level spark plugs that NGK has to offer.
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