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Small block top end oiling with Edelbrock heads #1844274
06/08/15 02:38 PM
06/08/15 02:38 PM
Joined: Feb 2005
Posts: 18,568
PA.
pittsburghracer Offline OP
"Little"John
pittsburghracer  Offline OP
"Little"John

Joined: Feb 2005
Posts: 18,568
PA.
Pulled my 408 out of my Duster yesterday after running a couple of new bests (9.74 and 9.73) as I had low oil pressure at idle and a couple of cylinders with bad leak-down numbers as I had some alcohol carb issues that lead to washing out my ring seal. While I have it apart I am going to drill and tap the oiling hole in my edelbrock heads so I can cut back on the amount of oil getting up top.Thinking i will start out with about a .065-.070 orfis hole. Have any of you guys done this and if so what size feed hole did you end up with?


1970 Duster
Edelbrock headed 408
6.143@110.85 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: Small block top end oiling with Edelbrock heads [Re: pittsburghracer] #1844282
06/08/15 02:44 PM
06/08/15 02:44 PM
Joined: Jan 2007
Posts: 7,430
Mt Morris Michigan
mopar dave Offline
master
mopar dave  Offline
master

Joined: Jan 2007
Posts: 7,430
Mt Morris Michigan
i'v been told by a few that .060" is plenty.

Re: Small block top end oiling with Edelbrock heads [Re: mopar dave] #1844292
06/08/15 02:55 PM
06/08/15 02:55 PM
Joined: Feb 2005
Posts: 18,568
PA.
pittsburghracer Offline OP
"Little"John
pittsburghracer  Offline OP
"Little"John

Joined: Feb 2005
Posts: 18,568
PA.
Originally Posted By mopar dave
i'v been told by a few that .060" is plenty.




Thank-you


1970 Duster
Edelbrock headed 408
6.143@110.85 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: Small block top end oiling with Edelbrock heads [Re: pittsburghracer] #1844299
06/08/15 03:08 PM
06/08/15 03:08 PM
Joined: Nov 2004
Posts: 1,708
S. Il. U.S.A.
5spdcuda Offline
top fuel
5spdcuda  Offline
top fuel

Joined: Nov 2004
Posts: 1,708
S. Il. U.S.A.
Rather than drilling and tapping I used to cut short sections of 1/4 inch round stock and drill holes in the stock and drop them into the holes below the rocker shafts in my old iron heads. I don't know any reason why it wouldn't work on Eddies or other aluminum heads as well. The big advantage to this method is the ease of removal in the event you need either more or less oil to the heads. All you need is a magnet or a pick. It's very easy to make up several sizes, sort of like changing carb jets.

Re: Small block top end oiling with Edelbrock heads [Re: pittsburghracer] #1844310
06/08/15 03:31 PM
06/08/15 03:31 PM
Joined: Feb 2005
Posts: 18,568
PA.
pittsburghracer Offline OP
"Little"John
pittsburghracer  Offline OP
"Little"John

Joined: Feb 2005
Posts: 18,568
PA.
I feel if I drill and tap it like I did on the feed lines to my 440-1 heads I will have unlimited adjust-ability. Just remove the shaft and unscrew the drilled set screw so I could go smaller or bigger with the drilled hole in the set screw.


1970 Duster
Edelbrock headed 408
6.143@110.85 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: Small block top end oiling with Edelbrock heads [Re: pittsburghracer] #1844328
06/08/15 04:04 PM
06/08/15 04:04 PM
Joined: Jan 2003
Posts: 7,300
Tulsa OK
Bad340fish Offline
master
Bad340fish  Offline
master

Joined: Jan 2003
Posts: 7,300
Tulsa OK
This is something I am looking at doing on my Eddie headed 360. Every time I have torn this motor down I have had good oil pressure etc, but the bearings never look good. It full time oils the rockers and I have it unrestricted and I think my next inspection I will restrict the oil up top and give that a shot. I have always liked all the oil up top because its a street car and I do drag week with it and the valvetrain has always been happy...but bottom end not so much even though I never see any issues on the oil pressure guage.


68 Barracuda Formula S 340
87 "Chrysler" Conquest
Re: Small block top end oiling with Edelbrock heads [Re: Bad340fish] #1844448
06/08/15 07:19 PM
06/08/15 07:19 PM
Joined: Jan 2003
Posts: 9,627
Weddington, N.C.
Streetwize Offline
master
Streetwize  Offline
master

Joined: Jan 2003
Posts: 9,627
Weddington, N.C.
These are 5/16 ID x .370" od x .700" long, they restrict oil to the shafts (assuming you have .375 holes in your shaft oil feed hole) the same amount...without having to pull the heads. Works great.

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Re: Small block top end oiling with Edelbrock heads [Re: Streetwize] #1845427
06/09/15 10:35 PM
06/09/15 10:35 PM
Joined: Jan 2003
Posts: 4,615
Kissimmee Fl.
D
dusturbd340W5 Offline
master
dusturbd340W5  Offline
master
D

Joined: Jan 2003
Posts: 4,615
Kissimmee Fl.
also depends on what rockers, I was running HS and I was down to .045 and still had plenty of oil up top.


70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4






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