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I was pre-oiling a 440 today and decided to take some data to share with others.
As many know, the big block heads are oiled from the #4 cam bearing through passages in the block to each rocker shaft. Each head gets oil only when the holes in the cam line up with the supply hole in the block and with the hole to that head, ie. once every two crank revolutions. When pre-oiling, I like to watch both the lifter gallery purge air and both rocker assemblies oil every rocker, especially on the pushrod end of adjustable rockers. I rotated the engine by hand while running the oil pump with a drill turning backwards (counter clockwise) through the distributor hole in the block. The passenger's side head recieved oil from about 30 to 10 degrees before TDC with #1 cylinder on valve overlap. The driver's side head recieved oil from about 30 to 50 degrees after TDC with the #1 cylinder on compression (#6 overlap). I hope this helps people save time pre-oiling their next big block Mopar ! ------------------ 440 Jim E-Body Fish [This message has been edited by 440 Jim (edited September 01, 2000).] |
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Hey 440, great tips! I have a friend just getting ready to fire up his BB. This should help. Thanks.
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Let me know if this checks out (approximately) with others experiences.
I don't know if every cam manufacturer puts the holes in the cam in the same relative location to valve action/crank. My data was with a Lunati cam (#30306). ------------------ 440 Jim E-Body Fish |
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Hey 440 Jim, I made the same observations when I built my first BB MoPar. NOW those oiling parculiarities are not mentioned in anything I have ever read so when I noticed that one head was oiling and one wasn't I thought I missed something on the buildup. After thinking about it a bit I cranked the engine around and volia! Oil to the other side. It goes to show you nothing teaches like hands on! |
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so strange you would bring this up(good)
literaly yesterday after cam swap (hughes /440 challenger) started tripping cuz no(pre drill) oil was coming out of one of the heads! thought bad gasket/pluged block ect! looked in my shop manual and saw just what you are talking about! good info for sure! was burnt and did trip for a second,info will save someone minor griefidge! later christian. |
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