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Author
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Topic: Rocker arm stud size question? So confused!
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BLstangin
Gearhead Posts: 779
From: St. James, MN
Registered: Apr 2002
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posted 06-12-2003 10:48 PM
   
I currently have the 5/16 rocker arm studs, or at least that is the nut size, they are stock, but the shank size measures .375 which is 3/8. I want to run 3/8 screw in studs, but I can't afford new rocker arms right now, can I use my original ford rocker arms and pivot balls with 3/8 studs. Also if I bought the crane kool nuts or similar would I be able to fully adjust my rocker arms? Would this type of nut fit under my stock valve covers? I need to order parts soon to get my motor together, someone help me, I don't know what to do? If I can't do this I will have to get 5/16 studs and use comp cams adjusting kit. My spring pressure will be 125 closed at an installed height of 1.8 and 275 open at a height of 1.2 Will the 5/16 nut size studs be strong enough? The cam will have .512 lift.------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 06-12-2003 11:59 PM
Crane makes a 5/16 conversion stud kit with 5/16 threads on the bottome and 3/8 shank and threads on the top to use 3/8 rockers.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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BLstangin
Gearhead Posts: 779
From: St. James, MN
Registered: Apr 2002
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posted 06-13-2003 12:10 AM
Alex, thanks for the help, but I am still cofused. I guess what I am trying to ask is can I use the factory rocker arms for a 70 engine with the 3/8 studs? And if I get those kool nuts will my valvetrain be fully adjustable, or do I need some special washers or something?  ------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 06-13-2003 10:27 AM
If you currently have the "rail" type rockers I would suggest swapping them in favor of the early flat tip units and some poly or cool lock nuts.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
BLstangin
Gearhead Posts: 779
From: St. James, MN
Registered: Apr 2002
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posted 06-13-2003 11:07 AM
I would need guideplates to use the flat tip rockers wouldn't I?------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
IP: Logged |
Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 06-13-2003 11:20 AM
Yes, if you do not have the slotted push rod holes in your heads.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
BLstangin
Gearhead Posts: 779
From: St. James, MN
Registered: Apr 2002
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posted 06-13-2003 03:16 PM
I can't afford to do all of that right now, so I am stuck with my rail type rockers. The screw in studs I am looking at are by mr. gasktet co. and they only require you to tap hole in the head and thread them in until they bottom out. Would 5/16 studs be strong enough for 275 pound open pressure?------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
IP: Logged |
Bloose
Gearhead Posts: 621
From: Milwaukee, WI
Registered: Dec 2001
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posted 06-13-2003 05:00 PM
I'm a bit confused. Do you currently have press in studs and a nut you screw on the stud to adjust the rocker arm (and a "rail" early model type rocker). Or do you have bolt down rockers with a stamped steel rocker and a bolt down fulcrum (late model)?I may be confused but it sounds to me like Alex and you are talking about two different styles. Maybe you could indicate the year of the heads you have. Regardless of the type there is a way for you to run studs. With the bolt down stuff you can run a Comp Cams stud that screws into a 5/16 hole and is 3/8 on the top. I have these in my motor and even machined them to use with guide plates. Machining is not needed if you use the stock rail style rocker or the Comp Cams Magnum Roller Tips in Rail Style. If you have press in studs you need to remove the studs and tap the holes. I am not sure of the complete insalation of these as I have never done it, but I think you need to machine them down too if you want to run guide plates. Again, if you run rail style rockers you will likely not need guide plates. Visit Comp Cams web site and you should be able to find what you need. B-loose [This message has been edited by Bloose (edited 06-13-2003).]
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BLstangin
Gearhead Posts: 779
From: St. James, MN
Registered: Apr 2002
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posted 06-13-2003 06:11 PM
I am running 70 351w heads. They currently have the 5/16 nut on the top and are non adjustable. They are press in studs. They are rail type. What I need to know is will they fit 3/8 studs or not? The top of the stud looks like it is machined down and they then use a 5/16 nut so that they jam against the stud. The part of the stud the pivot balls sits on measures 3/8 in diameter though. What I need to know is since the hole in the pivot ball is 3/8 can I run the stock rocker arms with 3/8 studs? And if I put something like the crane kool nuts on them are they then fully adjustable?------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
IP: Logged |
steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-13-2003 06:17 PM
Crane's kool nuts will make them adjustable.  SteveW
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BLstangin
Gearhead Posts: 779
From: St. James, MN
Registered: Apr 2002
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posted 06-13-2003 06:25 PM
Will the kool nuts fit under stock valve covers?------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
IP: Logged |
67coupe
Gearhead Posts: 488
From: dallas NC usa
Registered: Nov 2000
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posted 06-15-2003 11:20 AM
ok ive done this before what u need to do is pull out the press in studs and machine down the surface .230" then tap the hole out to a 7/16 14 thread and use whoevers 3/8 screw in studs u perfer the bottom will have 7/16 thread and use a poly lock or kool nut to adjust ur stock rockers on those studs if u have any ? email me good luck------------------
Josh
67 coupe with 351c
8.41 in the 1/8
1.90 60'
at 82.03 mph
94 Explorer
30 model A currently rustbucket
in process 67 convt with efi 5.0 and t5
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