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Old 09-10-2005, 01:58 PM
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Those holes are not for oil drain back... They are for ventilation more than anything... The timing chain or gearset is lubed mainly via the sump... Some oil may even sling off the chain and into the lifter area but it all drains back via the holes in the lifter area or the back of the block area... Just remember the engine should have a 2-3 degree slant to the rear... (gravity does the rest)
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