I'm sure you already know.
All of the relevant parts that are failing in significant numbers (rotating assembly etc) on the L87 are the same on the LT1.
FWIW, AI seems to think the LT1 may have different application specific rod/crank bearings for higher revving applications.
Quote:
Yes, while the LT1 and L87 share similar Gen V architecture, connecting rods, and crankshafts, they do not necessarily use the exact same rod/crank bearings in production, and they are generally treated as different applications regarding bearing specifications due to different intended uses (high-RPM performance vs. truck towing/start-stop).
Key details regarding bearing differences:
Interchangeability:
Aftermarket bearing manufacturers often list the same part numbers (e.g., King CR8057MC) as compatible across 6.2L Gen V engines, including LT1, L86, and L87. However, this indicates they can fit, not that the factory parts are identical.
Manufacturing Differences:
The L87 (truck) has faced widespread reported bearing issues and failures, often linked to manufacturing defects and sediment buildup, which are not common in the LT1.
Operating Differences:
The LT1 is designed for high-RPM use and typically uses 40w oil, while the L87 is designed for low-end torque and efficiency (start/stop) and often calls for 20w oil, implying different bearing clearances and potentially different bearing materials or coatings to suit those needs.
Technical Bulletin:
A GM Technical Service Bulletin notes that various 6.2L engines, including both L87 and LT1, are susceptible to crankshaft thrust bearing issues (knocking/hard rotation).
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Back on your topic, I'd wait it out for GEN VI V8 models at this point. Prob a whole different problem set of unknowns, but still better than a known lemon.