6.2L LS3 V8 Service Specifications
This is a working reference for the GM 6.2L LS3, the V8 in the 2005-2013 Gen-IV small-block family and the base engine of the 2008-2013 C6 Corvette. Every figure below is pulled from genuine GM Service Information, re-expressed in our own structure, and rendered in both metric and imperial so you can read it the way your torque wrench is marked. We do not reprint the published manual; we organize its numbers so a single value is easy to find and trust.
Browse by category, or jump straight to a fastener's full tightening sequence. Where the published manual is wrong, we say so.
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Torque & Fasteners
Every bolt, stud, nut, and plug with its full tightening sequence — torque passes, turn-of-the-nut angles, and which ones are torque-to-yield.
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Clearances
Running clearances, end play, ring gaps, and journal tolerances, with production and service limits side by side in metric and imperial.
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Engine Mechanical
The full spec sheet, organized: bore and stroke, compression, firing order, and the dimensions for every major assembly.
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Threads & Thread Repair
Thread sizes per hole plus the insert kit, drill, and tap depths for repairing stripped threads in the block and heads.
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Capacities & Fluids
Oil and coolant capacities, fuel-rail pressure, and the thermostat and cooling-fan trigger temperatures for the LS3.
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Ignition
Firing order, spark-plug gap and torque, and plug-wire resistance — the numbers you need for a tune-up.
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