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The tolerances have been tightened to ensure they are a very good fit to reduce vibrations and noise from the engine
nitrided journals for exceptional wear resistance
which resists thermal expansion for tight
The Atomic Dowelling Jig bolts directly to the rear crank flange
Atomic Barra Race Spec FULL Steel Oil Pump SOHC The tolerances have been tightenedAtomic Race Spec Steel Oil Pump Hand Finished & Ported Nitrided Billet Internals Why Upgrade to a Steel Housing? Factory alloy oil pumps and billet aluminium oil pumps have a fatal flaw: thermal expansion. As your engine gets hot, the aluminium housing expands faster than the steel gears inside, increasing internal clearances and causing oil pressure to dropexactly when you need it most. Additionally, under high RPM harmonics, alloy housings can flex,
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