Gas-powered internal combustion engines need spark plugs to (literally) ignite and complete the combustion stroke, enabling the motor to produce power. They may seem unusual to the untrained eye, but ...
In this stage of the refresh of our ’04 Chevy Avalanche 1500 Z71, we’re tackling the engine. Like millions of GMT800 pickups and SUVs, ours is equipped with the venerable LM7 iron-block 5.3L Vortec ...
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