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By virtue of their location in the valley area between the cylinder banks, the LS1's knock sensors are excellently positioned in the block to sense engine acoustics. They look the same as the knock sensors GM has been using since the TPI days, but are specially tuned for the acoustic signature produced by abnormal combustion in the LS1's aluminum-block engine. They are torqued to 15 lb-ft with a 7/8 deep socket. Don't overtighten these suckers, they're sensitive pieces of equipment! The piece of wiring harness that connects to these two sensors must also now be installed as the intake manifold is soon to go on atop them. View Related Article
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