Lifter Tray Mod
I have been drilling these holes for a few years with good results. We always use a roto-broach cutting tool instead of a drill, this may help. I have 69,000 miles on my truck now with the turbo engine that has these drainback holes, the engine was installed when the truck had 27 miles on it (after engine dyno thrashing!) and has held up well. We have also used this mod on all our road race engines, including endurance engines with no ill effects.
Kurt
Kurt
I could not say what this one mod does in a measurable way. In 1998 the Motorola cup Corvettes had some engine problems with using oil and oil related bearing failures, at the time dry-sump systems were not allowed. We added some holes in the pistons oil ring groove, changed to a napier second ring, that took care of the consumption. We drilled the lifter trays to get more oil back into the pan, and started running the oil 1 quart over full and the bearing problems stopped. They did allow the accusump shortly after, then the two stage scavenge dry sump the next year, but I think the lifter tray mod was helpful on the wet sump engines. We still use this mod today on any road race type engine.
Kurt
Kurt
Morel Link Bar LIfters
You can, Morel makes a very high quality link bar lifter for the LSx engines.
Morel Link Bar LIfters
Morel Link Bar LIfters
I would have given them a lot of consideration when I bought mine, unfortunately they came out later. I am running the standard Morel hydraulic lifters.
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if you look at the lifter trays its pretty obviously where you want to drill. you want to drill near the bottom where the oil would just sit, thus allowing it to drain from the trays
