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How can I tell if this 6.0 is 24x or 58x without tearing it down?
Look at the crank position sensor, on the side of the block behind the starter area: a black sensor means a 24x reluctor (Gen III), and a gray sensor means 58x (Gen IV). Supporting clues: Gen IV engines have the cam sensor on the front timing cover (Gen III has it at the rear of the block), use EV6/USCAR injectors, and are drive-by-wire. The PCM, harness and sensors must all match the reluctor type.
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Check the crank sensor on the side of the block: grey means 58x, black means 24x. Supporting clues are a VVT front cover and drive-by-wire throttle for Gen IV/58x, and a drive-by-cable setup for the older Gen III 24x. Also note whether the heads are cathedral-port or rectangular-port, since the intakes don't interchange without an adapter, and check oil pan, windage tray and pickup differences between donors.
Check this first:
- Crank sensor color (grey = 58x, black = 24x)
- Cam sensor location and throttle body type
- Head port shape before buying an intake
Based on what we've seen work across our own builds, our friends' builds and the wider LS community, reviewed by our lead shop tuner (over 20 years of LS and LT tuning experience). Every combination is different, so use at your own risk.
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Check this first
- Crank sensor color (grey = 58x, black = 24x) - factory sensors only
- Cam sensor location and throttle body type
- Head port shape before buying an intake
Try this, then this
- Cross-check cam sensor location + throttle type — independent of the crank sensor. Worked if: all three clues agree
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How you know it's fixed
- Sensor PN checked against 12703627; reluctor confirmed 24x or 58x
Still not fixed?
- Back it up with cam-sensor location (rear = Gen III/24x, front cover = Gen IV/58x) and DBW vs cable throttle
Time and cost: 10 minutes in the yard