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Drilled many without splitting the cases.Just flip the engine upside down or tape off the crank area with duct tape to catch the chips and grease the drill bit.Also helps to have a shop vac sucking the chips away.
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OK SO I READ MOST OF THE INFO ON THIS THREAD! ALTHOUGH A LOT OF INFO AND THE BELIEFS ARE GREAT I HAVE ONE PROBLEM WITH THE ORIGINAL IDEA.
OK HERE GOES IF YOU ARE PUTTING OIL IN THE WATER PUMP HOUSING BECAUSE OF AN OIL PUMP DELETE. PREMIX CAN'T LUBRICATE IT CORRECT. SOOO WERE DOES THE OIL GO IN THE WATER PUMP HOUSEING?
So basically the factory put the oil pump line to make sure oil was constant! Ok THANKS!
ok how about a t'd line from the carb boots to the center section using the stock line and fitting ? what are the thoughts on that and if you do some thing like this or the grease zerk is the bdx pice really needed ?
The proper way that has been proven to work 100% over the years is to pull a cyl off and drill a 45* hole in the upper case half down into the oil cavity so the water pump shaft gets oil from the fuel/oil premix.There is a hole there allready that supplys the bearing with oil,I drill right next to that at a 45 angle into the oil cavity.I have done over a 100 cases like this with never a failure or worry.No lines to worry about,gravity drips oil/fuel down into the hole at all times.No pumping action or anything else needed to make it work.
I belive D&D,Speedworks,CPC and others all do it this way also.....