Drilling holes in side of lifter trays for better oil control?
04-06-2012, 09:27 PM
#11
The reason that you drill the holes was stated earlier in the thread. It is to prevent oil from foaming due to sitting in the lifter tray from turning more rpm/ turning rpm for extended periods of time.
It does not help with lifter pump up, it doesn't make oil get back to the pan faster and it doesn't allow it to turn anymore rpm than it previously would have due to the hydraulic design.
Steven Kim covers this modification in his "How to build big inch GM LS series engines" and its all over the internet as well.
You drill a 1/2" hole and make sure to chamfer it to reduce any possible stress risers in the plastic retainer. To date, nobody who has drilled a hole for drainback has had a retainer failure stemming from drilling the hole. There have been retainers that have failed, but from other reasons (age ect).
It does not help with lifter pump up, it doesn't make oil get back to the pan faster and it doesn't allow it to turn anymore rpm than it previously would have due to the hydraulic design.
Steven Kim covers this modification in his "How to build big inch GM LS series engines" and its all over the internet as well.
You drill a 1/2" hole and make sure to chamfer it to reduce any possible stress risers in the plastic retainer. To date, nobody who has drilled a hole for drainback has had a retainer failure stemming from drilling the hole. There have been retainers that have failed, but from other reasons (age ect).
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