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 GM Service Information, re-expressed in our own structure, fact-checked against the hardware, 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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