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Old 06-18-2017, 10:26 PM
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Since this came up to the top again - the book is Chevrolet Power page 154 on the racing 90 degree V6 "The GM Motorsports Technology Group has developed a lubrication system modification that improves rod oiling at high speeds. this modification is highly recommended for V6/90 engines that are operated for sustained periods above 7500" "slot 0.150 wide and 0.150 deep" Modify the upper main bearing inserts by drilling two equally spaced 1/8" oil feed holes on both sides of the original oil hole making 5 holes in each upper bearing half"

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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
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1964 Impala SS 409/470ci 600 HP stroker project
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Old 06-19-2017, 05:44 PM
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Looks like I am going to have to be VERY careful with a cutoff wheel. I will have to use a very small diameter/worn out wheel too.
The pic shows the grove to the one side. Should it be done like this or does doing both sides have merit ?

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Old 06-19-2017, 07:43 PM
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The Chevy blocks they did both sides about the same.

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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
  #44  
Old 06-19-2017, 07:44 PM
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What about trying to drill a series of side by side holes and then use a small burr to connect the holes making a grove?

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Old 06-19-2017, 07:46 PM
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I would copy what BES did. Its proven way... Only one side

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Old 06-19-2017, 07:59 PM
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I took Tom Kilroy's engine apart no real trick oiling mods Luhne oil pump coated bearings 2 seasons racing I think 140 runs looked like the day I put it together made just under 1000 hp

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Old 06-19-2017, 08:01 PM
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Quote:
Originally Posted by Richie Hoffman View Post
I took Tom Kilroy's engine apart no real trick oiling mods Luhne oil pump coated bearings 2 seasons racing I think 140 runs looked like the day I put it together made just under 1000 hp
What's he revving it to Richie?

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Old 06-19-2017, 08:08 PM
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7800 8000

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Old 06-19-2017, 10:16 PM
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Originally Posted by Dragncar View Post
Looks like I am going to have to be VERY careful with a cutoff wheel. I will have to use a very small diameter/worn out wheel too.
The pic shows the grove to the one side. Should it be done like this or does doing both sides have merit ?
Dremel cutoff wheels come thick or thin....plus various burrs, routers and such. Suggest a good variable speed type. Also Dremel has drill type chucks available instead of using collets. Handy tool to have around.

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Old 06-19-2017, 10:23 PM
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could make a fixture that bolts to the main web where you want the groove,that has the groove shape in it. would work as a guild to help not to mess up , because chances are there will be a slip or 2 ...

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Old 06-20-2017, 08:08 AM
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I would use a double cut ball file chucked up in a 90 degree dotco.

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Old 06-20-2017, 09:32 AM
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X2 on the small ball cut Burr!

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Old 06-20-2017, 09:35 AM
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If you see Tony's stuff, it is obvious that they do it by hand, but that being said, they probably have had a lot of practice.

I am partial to copying the concept but having tools do the work consistently on each main saddle, (all the same).

Whether it makes any difference? Who would know? (if the "fix" takes care of the oiling issue and the engine runs great with either method).

Tom V.

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Old 06-20-2017, 11:30 AM
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Quote:
Originally Posted by Tom Vaught View Post
I am partial to copying the concept but having tools do the work consistently on each main saddle, (all the same).
Cut a slot in an old bearing and practice on an old block. Practice until you are confident in the outcome. Doesn't look to hard to duplicate. I wonder how the bearings were cut in the other pictures, they looked like they were done on a machine.

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https://m.youtube.com/watch?v=ePCu2v...ature=youtu.be

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Old 06-20-2017, 12:02 PM
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Quote:
Originally Posted by Tom Vaught View Post
I am partial to copying the concept but having tools do the work consistently on each main saddle, (all the same).
Since oil pressure drops, rear to front, might think about increasing the groove size moving forwards. Just to keep oil flow closer to the same for all journals.

Watcha think?
Clay

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Old 06-20-2017, 07:12 PM
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Quote:
Originally Posted by "QUICK-SILVER" View Post
Since oil pressure drops, rear to front, might think about increasing the groove size moving forwards. Just to keep oil flow closer to the same for all journals.

Watcha think?
Clay
There might be something to that deal but I am not smart enough to figure it out.

We did "oil surveys" on our research engines at work. Lots and lots of pressure taps and lot and lots of Thermocouples to read the temps. Mapped each new engine.
Roush typically did the work (actually testing the engine on a dyno) as using Research Engine Dynos was way too expensive to be running that kind of test.

Deal is as you change the pressure in the engine, the "Orifices" change in flow value so at the end of the day you size the oil flow holes for the best overall deal you can work out over the oil pressure/flow range of the engine. Hope that helps.

Tom V.

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  #57  
Old 06-21-2017, 06:13 PM
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Quote:
Originally Posted by BruceWilkie View Post
Dremel cutoff wheels come thick or thin....plus various burrs, routers and such. Suggest a good variable speed type. Also Dremel has drill type chucks available instead of using collets. Handy tool to have around.
Remember, I am a millwright/welder/fabricator that works out of a machine shop.
Use cut off wheels all the time. I have a 1/8" electric at the house that should do the trick.

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Old 06-21-2017, 06:17 PM
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GOFAST can do his bearing mod for around 150$. So thats another option.

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Old 06-22-2017, 06:03 PM
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Always wondered if there was a specific crank oil this better for feeding things?

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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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Old 10-07-2018, 04:04 PM
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Someone mentioned this again, so I brought it back up. I like GOFASTs option. Think I am doing that. Looks like it does the same thing and you don't have to cut into you block.

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