hawk02
Seasoned Member
Do you have documented proof that the 5BW and Escalade-V LT4s are different from earlier LT4s? This is the first I’ve heard of that. The only differences I’m aware of are that these engines are on GM’s Global B platform, which uses a faster and more encrypted ECM, and that they use wideband O2 sensors instead of narrowband, allowing the engines to always run in closed loop.The newer LT4s in the 5 Blackwing and Escalade V are different from the prior LT4s in the C7 Z06, ZL1 and V3, and also suffer an unusually high rate of bottom end failure, whereas the older LT4s had the usual lifter issues but had a stout bottom end. The actual number is speculative, but about a dozen CT5 V forum members have had bottom end engine failures. By comparison I haven't seen a single LF4 bottom end reported failure on this forum, so its not a normal or expected number of failures.
I owned a ’17 ZL1 for almost seven years and spent a lot of time on the Camaro6 forum. Oil pump failure was the biggest issue with the LT4 in the ZL1—especially in model years ’17 and ’18. You didn’t see this problem in the Z06 because it used a dry sump oiling system. Supposedly, GM modified the pump starting with the ’19 model year, but there were still some reports of failures beyond that. Almost everyone who did a cam upgrade on a ZL1 spent the extra money to replace the oil pump, since it was cost-effective to do it while the engine was out.