Drilling the Lifter Bosses

Author	Message
grovedawg	Posted 15 Years Ago
Supercharged Group: Forum Members Last Active: 13 Years Ago Posts: 246, Visits: 622	I've seen a couple of pics about drilling the lifter bosses, and possibly creating a V notch to catch and direct oil into the drilled holes to increase oil into the cam shaft, and then into the crank. (Picture is taken from an online article at Rods and Customs Mag) http://www.rodandcustommagazine.com/tipstricks/74739/photo_07.html I'm not really as concerned about windage, and loss of hp due to increased drag from oil dripping from the valley into the cam shaft, rods, and then onto the crank. I'd prefer to have a "better" oiled Y Block for a longer life. So, this is my question. Is it a good practice, when rebuilding a Y to drill holes into the lifter bosses? What Diameter? Should I drill at a perpendicular angle of the lifter4 into the boss (Or straight down towards the crank)? Does it matter? AM I SMOKING CRACK COCAINE? It is my plan to drill holes in all but the last two lifter bosses, and use about a 1/8 bit. What do the Y Block Gurus think? Heber City, UT (15 mins outside of Park City- basically it's in the mountains) 55 Effie
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Ted	Posted 15 Years Ago
Co-Administrator Group: Administrators Last Active: Today @ 3:21:49 AM Posts: 7.4K, Visits: 205.7K	Here are some past threads on the subject. More to be found if doing a search using various key words. Adding lifter valley holes for camshaft oiling Drilling additional holes for oiling and/or venting Valley holes for aiding crankcase evacuation Lorena, Texas (South of Waco)
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grovedawg	Posted 15 Years Ago
Supercharged Group: Forum Members Last Active: 13 Years Ago Posts: 246, Visits: 622	I should've searched first. Thanks. PS. I loved this post! Ted (11/9/2009) oldcarmark (11/8/2009) Hello Ted! I amOK by just installing new correct grooved bearing as part of my stock rebuild or is this cutting a groove in the block a good idea anyway and how deep should this groove be? By restrictors are you meanining plug the return fitting at the end of the shaft or actually putting a restrictor in the feed hole in the rocker support stand? I’m grooving the center cam bearing hole in the block for all Y builds. If the softer cam bearing set is used (usually cost less $), then the grooved camshaft can ultimately cause restricted or no flow to the top end due to the groove in the cam journal being pinched off by the softer bearing material being mashed into it. The addition of the groove in the block behind the cam bearing gets around this. I make the grooves ~.040”-0.055” deep with them being about 1/16” wide. As far as restricting the oil to the top end, I’m doing it at the pedestal just before the oil enters the rocker shaft. I do still run the overflow tubes but these are partially pinched to allow some oil flow through them to get oil specifically to the timing gear. Leaving them partially open also insures that the rocker shafts are purged of air and full of oil which reduces the tendency for sludging in the shafts by keeping the oil moving at a faster rate. The distributor gear appears to get enough lubricant regardless if the rocker arm overflow tubes are eliminated or not. When eliminating the overflow tubes, there are those who have drilled a small oil hole in the front of the block under the cam thrust plate to provide additional oil to the timing set. That looks to be a viable option also. Here’s a past thread giving more detail on timing gear oiling mods. Pressurized timing chain oiling And here’s a variety of past threads on oil modifications in general. Center cam bearing Pressurized rocker shafts Pressurized rocker shaft more Rocker arm overflow tubes Cons Rocker arm overflow tubes Pros Rocker arm overflow tube More Pros Timing chain oil trough Adding lifter valley holes for camshaft oiling Drilling additional holes for oiling and/or venting Valley holes for aiding crankcase evacuation Tanks again Ted, and all of you other Y heads out there! Heber City, UT (15 mins outside of Park City- basically it's in the mountains) 55 Effie
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Drilling the Lifter Bosses

Drilling the Lifter Bosses

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