Legal Ford 5.0 head with screw in studs

7423 · 07-06-2010, 08:14 PM

I understand that guide plates are legal when going from the OE design to a stud and poly lock.
Is the guide plate conversion talked about in the rule book, can't seem to find anything about it.
Which fulcrums can I use with the OE rocker?
Doing up a good set of heads and would like to do the conversion at the same time
Thanks much
Charlie

Rory McNeil · 07-06-2010, 09:13 PM

Charlie, I just went thru this with my 85 Mustang. Although it may be possible to drill the factory rocker fulcrums out to 3/8 or 7/16`s, what I did was have 7/16`s studs installed, and I used a set of the factory Boss 302 , Boss 351, 429SCJ rocker fulcrums. These fulcrums are drilled for 7/16" studs, and don`t have square "lug" on the bottom, that the factory 5.0 non adjustable rockers use to keep the rocker centered over the valve. As far as I know, these fulcrums are obsolete from Ford, I happened to find a NOS set of 16 in a local car parts magazine. The Ford part number on the box of fulcrums is D0OZ-6A528-C if that helps. Maybe some Ford racer or shop might have some laying around. I`ll be racing in Sonoma, so I could show you what they look like. Good luck.

7423 · 07-06-2010, 09:29 PM

Thanks Rory, I look foward to seeing you in Sonoma, I will be there for both weekends. Maybe PartsBob could tell us if that part # is still alive today..............

partsbob67 · 07-06-2010, 10:29 PM

i'l look tomorrow and report back in.

west coast · 07-07-2010, 09:22 AM

You can use older 302 rockers and ball studs with guide plates ask NHRA this question earlier this year I am also working on a set for better adjustablity. I have the email from NHRA that says it is legal.

partsbob67 · 07-07-2010, 12:19 PM

no longer available, and no listing dealers with any nos stuff laying around. maybe check out hemmings for somebody with a set for sale. or a boss 302 restoration specialist. see you guys in sonoma.

7423 · 07-07-2010, 03:57 PM

Quote:

Originally Posted by west coast

You can use older 302 rockers and ball studs with guide plates ask NHRA this question earlier this year I am also working on a set for better adjustablity. I have the email from NHRA that says it is legal.

Westcoast
Just got off the phone with Pat in the tech office, his quote was "machining the rocker bosses on the head is NOT legal". Milling the pedastils to accept a screw in stud and guide plate would be the only way to locate the pushrod using the OEM style non railed rocker arm. Not really the answer I needed to hear but that is what NHRA tech told me. How can I see a copy of that email that you have?
Thanks again
ccccccc

07-06-2010, 08:14 PM	#1
7423 Senior Member Join Date: Dec 2006 Posts: 639 Likes: 0 Liked 1 Time in 1 Post	Legal Ford 5.0 head with screw in studs I understand that guide plates are legal when going from the OE design to a stud and poly lock. Is the guide plate conversion talked about in the rule book, can't seem to find anything about it. Which fulcrums can I use with the OE rocker? Doing up a good set of heads and would like to do the conversion at the same time Thanks much Charlie

07-06-2010, 09:13 PM	#2
Rory McNeil VIP Member Join Date: Jun 2007 Location: from Vancouver BC Canada, now in Nova Scotia Posts: 1,307 Likes: 312 Liked 1,090 Times in 299 Posts	Re: Legal Ford 5.0 head with screw in studs Charlie, I just went thru this with my 85 Mustang. Although it may be possible to drill the factory rocker fulcrums out to 3/8 or 7/16`s, what I did was have 7/16`s studs installed, and I used a set of the factory Boss 302 , Boss 351, 429SCJ rocker fulcrums. These fulcrums are drilled for 7/16" studs, and don`t have square "lug" on the bottom, that the factory 5.0 non adjustable rockers use to keep the rocker centered over the valve. As far as I know, these fulcrums are obsolete from Ford, I happened to find a NOS set of 16 in a local car parts magazine. The Ford part number on the box of fulcrums is D0OZ-6A528-C if that helps. Maybe some Ford racer or shop might have some laying around. I`ll be racing in Sonoma, so I could show you what they look like. Good luck. __________________ NHRA 6390 STK M/S 85 Mustang

07-06-2010, 09:29 PM	#3
7423 Senior Member Join Date: Dec 2006 Posts: 639 Likes: 0 Liked 1 Time in 1 Post	Re: Legal Ford 5.0 head with screw in studs Thanks Rory, I look foward to seeing you in Sonoma, I will be there for both weekends. Maybe PartsBob could tell us if that part # is still alive today.............. Last edited by 7423; 07-06-2010 at 09:31 PM.

07-06-2010, 10:29 PM	#4
partsbob67 Member Join Date: Apr 2005 Location: rohnert park,ca Posts: 414 Likes: 11 Liked 79 Times in 11 Posts	Re: Legal Ford 5.0 head with screw in studs i'l look tomorrow and report back in. __________________ bob beals 7244

07-07-2010, 09:22 AM	#5
west coast Senior Member Join Date: Dec 2008 Location: Rainy Washington Posts: 607 Likes: 12 Liked 218 Times in 71 Posts	Re: Legal Ford 5.0 head with screw in studs You can use older 302 rockers and ball studs with guide plates ask NHRA this question earlier this year I am also working on a set for better adjustablity. I have the email from NHRA that says it is legal.

07-07-2010, 12:19 PM	#6
partsbob67 Member Join Date: Apr 2005 Location: rohnert park,ca Posts: 414 Likes: 11 Liked 79 Times in 11 Posts	Re: Legal Ford 5.0 head with screw in studs no longer available, and no listing dealers with any nos stuff laying around. maybe check out hemmings for somebody with a set for sale. or a boss 302 restoration specialist. see you guys in sonoma. __________________ bob beals 7244