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  Mustangsandmore Forum Archive
  '69 to '73 -- The Musclecar Mustang
  comp cam roller rockers on 351w dooe heads

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Author Topic:   comp cam roller rockers on 351w dooe heads
jordanstang
Journeyman

Posts: 5
From: louisiana
Registered: Feb 2006

posted 03-19-2006 09:33 PM     Click Here to See the Profile for jordanstang        Reply w/Quote
i have some 351w dooe heads and some 1.6 magnum roller rockers 3/8 inch stud..rail type..ok now my nuts that came with the rockers are to big so i guess i had 5/16 studs ..ok in my papers that came with my rockers arms it said some ford engines came with bottleneck studs 5/16 top and 3/8 on the bottom and comp cams had a adjustable nut kit for it..now if i did not need them adjustable using this kit they have ,could i just use 5/16 inch nuts and that would work???..

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 03-20-2006 09:58 AM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
No, the difference in size will destroy your studs and your rockers in no time.

------------------
'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

[This message has been edited by SteveLaRiviere (edited 03-20-2006).]

buening
Gearhead

Posts: 317
From: Decatur, IL
Registered: Mar 2005

posted 03-20-2006 11:04 AM     Click Here to See the Profile for buening        Reply w/Quote
If they are still stock heads, you have press in studs that have 5/16" stud with the 3/8" shoulder. These are non-adjustable valvetrain heads, meaning you torque the rocker nut down and go. You adjust the valves buy getting shorter/longer pushrods. I'm not so sure you can use roller rockers on this type of valvetrain. Other more intelligent users than me should chime in.

------------------
1970 Grabber Blue Mach 1 H-code
1970 Fastback
2003 Torch Red Mustang

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 03-20-2006 11:28 AM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
That's right, actually. Positive stop studs trap the fulcrum and get torqued down, so you can't even use the rocker arms with the trunnions, like roller rockers.

------------------
'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

jordanstang
Journeyman

Posts: 5
From: louisiana
Registered: Feb 2006

posted 03-20-2006 02:29 PM     Click Here to See the Profile for jordanstang        Reply w/Quote
well i called comp cams the ones who makes the roller rockers arms i have..and they said they are made for non adjustable ford heads..and from what i told him that dooe 351w heads have a bottleneck studs with 3/8 shoulder and 5/16 threads..he could see no reason why i could not use a 5/16 inch nut to bolt them down with..i know i went to autozone and bought a one stock cast iron rocker arm to look and compare it's ball frucrum is 3/8 and it came with a a 3/8 nut and a 5/16 inch nut

cobraii351
Journeyman

Posts: 87
From: Altoona, PA
Registered: Jun 2000

posted 03-21-2006 07:21 AM     Click Here to See the Profile for cobraii351        Reply w/Quote
They will work fine as long as you use a "poly-lock" lock nut on top. These are the "drop-in replacement" Crane rockers with just a roller tip. I have them on my heads as well but I eventually changed out the studs for my own piece of mind.

------------------
76 Cobra II
351W powered
C90x "shelby" intake
Ported D0OE heads
Holley 600
http://webpages.charter.net/cobraii351/

jordanstang
Journeyman

Posts: 5
From: louisiana
Registered: Feb 2006

posted 03-21-2006 09:06 AM     Click Here to See the Profile for jordanstang        Reply w/Quote
ok so u are running the crane rockers mine are comp cam magnums..i see where they say use there adjusting nut kit so i take it that is there polylocks nuts for these rockers then..

buening
Gearhead

Posts: 317
From: Decatur, IL
Registered: Mar 2005

posted 03-21-2006 01:13 PM     Click Here to See the Profile for buening        Reply w/Quote
Check CompCams online catalog. In the section of the polylocks, they sell a conversion kit for smallblock fords to convert from non-adjustable to fully adjustables. I went this route and am very happy. Comes with a washer/spacer and a nut for each valve. The nut has tighter thread tolerances to allow it to keep its setting without rattling loose like the stock nuts do. I learned something new today. Wasn't aware they made roller rockers for the older heads.

------------------
1970 Grabber Blue Mach 1 H-code
1970 Fastback
2003 Torch Red Mustang

cobraii351
Journeyman

Posts: 87
From: Altoona, PA
Registered: Jun 2000

posted 03-21-2006 05:09 PM     Click Here to See the Profile for cobraii351        Reply w/Quote
Yes, I'm sorry my mistake I too have the Comp Cams rockers you have... My brain was thinking one thing and my finger typed something else...

Tim

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