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Small block top end oiling with Edelbrock heads
#1844274
06/08/15 03:38 PM
06/08/15 03:38 PM
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Joined: Feb 2005
Posts: 20,201 PA.
pittsburghracer
OP
"Little"John
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OP
"Little"John
Joined: Feb 2005
Posts: 20,201
PA.
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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 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: Small block top end oiling with Edelbrock heads
[Re: mopar dave]
#1844292
06/08/15 03:55 PM
06/08/15 03:55 PM
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Joined: Feb 2005
Posts: 20,201 PA.
pittsburghracer
OP
"Little"John
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OP
"Little"John
Joined: Feb 2005
Posts: 20,201
PA.
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i'v been told by a few that .060" is plenty. Thank-you
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: Small block top end oiling with Edelbrock heads
[Re: pittsburghracer]
#1844310
06/08/15 04:31 PM
06/08/15 04:31 PM
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Joined: Feb 2005
Posts: 20,201 PA.
pittsburghracer
OP
"Little"John
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OP
"Little"John
Joined: Feb 2005
Posts: 20,201
PA.
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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 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: Small block top end oiling with Edelbrock heads
[Re: pittsburghracer]
#1844328
06/08/15 05:04 PM
06/08/15 05:04 PM
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Joined: Jan 2003
Posts: 8,035 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,035
Tulsa OK
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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
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Re: Small block top end oiling with Edelbrock heads
[Re: Streetwize]
#1845427
06/09/15 11:35 PM
06/09/15 11:35 PM
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Joined: Jan 2003
Posts: 4,616 Kissimmee Fl.
dusturbd340W5
master
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master
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
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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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