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Drill and tap for 1/2" pickup. Drill hole below threads to 11/16" and 2.94" deep. Drill pickup hole at pump mounting surface 5/8" and 1.56" deep, radius and deburr the intersection point. Drill pump pressure hole to gallery 9/16" and 7.62" deep. That will convert to Hemi oiling system. This page 270 and 271 of "Engine speed secrets & racing modifications for Chrysler V-8 engines" Eighth edition. Part # P5249010.

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Any opinions on this mod from BBDart....?


http://www.bigblockdart.com/index.php?PH...29886.msg322814

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Any opinions on this mod from BBDart....?


http://www.bigblockdart.com/index.php?PH...29886.msg322814

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I just read it , I like the idea of drilling thru and oiling it that way, but I'm in the camp of blocking off the feed passage thru the cam. A lot of what's posted in the tech section here is what I posted from the oiling mod recommendation I received years ago from Herb McCandless. Herb recommends reducing the oil hole to all the cam bearings, EXCEPT number 4, to .125. This puts more oil to the crank and rods as you don't need to FLOOD the cam bearings.

The first block I did this to I tapped the passage and installed a loctited set screw with the hole drilled in it. Now I just drill a the hole in the cam bearing 180 from the original hole and have the bearing installed that way. The same should be done to #4 with that mod because as noted #6 and #7 are the rods that usually spin from lack of oil flow, anything done to increase the oil flow to them is a smart mod.

Even though my Hemi has a grooved cam, I think but I'm buying a new cam for it, I'm going to do this mod, block the cam passage and restrict the cam bearing feed hole as I have seen 6 + 7 being the typical to spin in a Hemi because the Hemi sends a lot of oil up top due to it feeding 4 full length rocker shafts.

take it for what it's worth ...

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Thanks for posting it up Wild Bill! Sure hope it helps some people out!

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Any time

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The discharge passage is only 0.5" dia from the factory, but the block can be 9/16 to 5/8". So I drill it to 9/16" dia, but not all the way to the o-ring groove. There isn't enough room, so I blended it there.

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The discharge passage is only 0.5" dia from the factory, but the block can be 9/16 to 5/8". So I drill it to 9/16" dia, but not all the way to the o-ring groove. There isn't enough room, so I blended it there.

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I do all the tricks too but...
I go all the way through the pump housing.. I still have metal for the inner boss but it is very thin. I replace the o-ring with a rubber gasket. I get the gaskets from ACE Hardware.

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The discharge passage is only 0.5" dia from the factory, but the block can be 9/16 to 5/8". So I drill it to 9/16" dia, but not all the way to the o-ring groove. There isn't enough room, so I blended it there.

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I do all the tricks too but...
I go all the way through the pump housing.. I still have metal for the inner boss but it is very thin. I replace the o-ring with a rubber gasket. I get the gaskets from ACE Hardware.

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That's a sneaky (nice) variation there. Are the gaskets originally intended as faucet washers or something special?

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Yeah..they're faucet washers. I use a hole punch made out of 1/2" conduit to cut the center the correct size. I put a dab of gray Permatex in it before putting the new seal in.