What the major LS engine parts do
Use this video as a visual walkthrough before reading the part cards below. It helps connect the camshaft, crankshaft, pistons, bearings, valvetrain, oiling parts, and seals into one working engine system.
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Most Important Upgrade
Foundation Refresh
Critical Fit
Compression Seal
Cam Support
Oiling Support
Parts basics
Understand what each LS part does before buying.
These notes explain why common LS parts matter and when they are cost effective during a cam swap, rebuild, or performance setup.
Camshaft
The camshaft controls when the valves open and close. On an LS engine, it is one of the biggest power changes you can make without replacing the entire engine.
- What it changes
- Power curve, idle sound, torque, horsepower, and required tuning.
- Cost effectiveness
- Very high when matched with springs, pushrods, valve seals, and tuning.
Crankshaft Bearings
Main and rod bearings support the crankshaft and connecting rods while oil keeps the rotating assembly alive.
- What they protect
- Oil pressure, crank journals, rods, and long-term engine life.
- Cost effectiveness
- Very high during a rebuild, especially after machine-shop measurements.
Cam Bearings
Cam bearings support the camshaft inside the block. Gen III LS engines can have important cam bearing differences by year and block.
- What they protect
- Camshaft alignment, oil control, and stable valvetrain operation.
- Cost effectiveness
- High during a full teardown, but must be matched to the exact block.
Piston Rings
Piston rings seal combustion pressure, control oil, and help the engine make clean compression.
- What they restore
- Compression, oil control, blow-by reduction, and cylinder sealing.
- Cost effectiveness
- Very high if the cylinders are healthy or freshly honed.
Valve Springs
Valve springs control the valves at higher lift and RPM. A bigger cam usually needs better springs.
- What they prevent
- Valve float, unstable RPM, and power loss from weak spring control.
- Cost effectiveness
- High when paired with a camshaft, low if the cam does not need them.
Oil Pump
The oil pump feeds the bearings, lifters, camshaft, and valvetrain. It is smart to refresh when the front cover is already off.
- What it supports
- Oil pressure, bearing life, lifter function, and startup protection.
- Cost effectiveness
- High during rebuilds and cam swaps where access is already open.
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