Hybrid How-To No 16: Building the LS/VTEC engine
If you need it, this blank spot on the upper portion of the block is a perfect location for a knock sensor. Simply drill it out with a 10.9mm bit, tap it to 12mmx1.25mm and thread in the sensor with sealant. Watch out for metal shavings since this is where the oil drains back from the head.
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