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

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.

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..............

Re: Legal Ford 5.0 head with screw in studs
 

i'l look tomorrow and report back in.

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.

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.

Re: Legal Ford 5.0 head with screw in studs
 

Thanks for checking partsbob................

Westcoast, my next call and email will be to Glendora so I can have my own copy of that ruling................................Thanks much for the help
cccccc

Re: Legal Ford 5.0 head with screw in studs
 

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

Re: Legal Ford 5.0 head with screw in studs
 

How about using Comp Cams #4504 stud with older 302 "rail rocker arms",no machining is needed for the stud, its 5/16" on the head side ,and 3/8" up top. Crane makes a rail rocker for older 302 engines,# 36801-16,I have a set that I was going to try on my old H.O combo before I went the 93 cobra route. Jegs has them.

Re: Legal Ford 5.0 head with screw in studs
 

Jerry, where have you been? When are you going to come out and run with us at Heartland? Jim

Re: Legal Ford 5.0 head with screw in studs
 

are you guys having trouble with your stock rocker arms?

Re: Legal Ford 5.0 head with screw in studs
 

What is everyone's take on this? The Rocker Arms section was updated Jan. 19th, 2012 and says:

"OEM or aftermarket rocker arms permitted. Needle/roller bearing pivots and roller tips are permitted for all applications. Must remain same design as original application (ie: stud mount must retain stud mount, pedestal type must retain pedestal type and shaft type must retain shaft type. Stud girdles prohibited) Stamp steel OEM and OEM-type rocker arms may be reinforced."

also under the cylinder heads section it says:

"The following are permitted: polylocks, jam nuts, screw-in larger diameter rocker studs, or pinned studs..."

I'm finishing up a stocker 5.0 Mustang. Using stock rockers, not rollers, would you say that screw-in studs are legal? I'm getting conflicting feedback on this.

Thanks

Re: Legal Ford 5.0 head with screw in studs
 

I ask this same question to Pat at Phoenix National earlier this year. He said it was up to Bruce to make this call. I have a set in the works with screw in studs but have stopped until I find some more info just have not sent any email to NHRA lately, I need to do this but the start of race season interfered. Here what I have done since then order ford part# M-6564-B351C from Paul at RACEMART( this is the best price on them) this is an adjustable roller rocker which helped out in time to adjust your valves. I have a set of stock after market rockers I think they are comp cams stuff that is better material, that is now obselete for me.

Re: Legal Ford 5.0 head with screw in studs
 

For me the issue is making valve adjustments. Not messing with shims makes the job a lot easier, but that being said, I still have the stock ones at this point.

Re: Legal Ford 5.0 head with screw in studs
 

NHRA allowed the use of guide plates and studs prior to the new roller rocker rule.

They have also allowed the stud and guide plate kit from Crane Cams since the 1990's not only on the 351-C but also the SBF's. Their kit consists of studs, nuts and a Nylon material style guide plate.

Look at Rory's previous message; he runs a fully adjustable rocker arm system like many others.

If you select the proper guide plate, stud and pushrod, you do not need to machine the pad to install guide plates.

Re: Legal Ford 5.0 head with screw in studs
 

[QUOTE

also under the cylinder heads section it says:

"The following are permitted: polylocks, jam nuts, screw-in larger diameter rocker studs, or pinned studs..."

I'm finishing up a stocker 5.0 Mustang. Using stock rockers, not rollers, would you say that screw-in studs are legal? I'm getting conflicting feedback on this.

Thanks[/QUOTE]

Screw in studs are legal if they screw into the original 5/16" course thread holes in the pedastal. I assume that is not the answer you were looking for. I confronted Bruce with this topic a couple years ago.

Re: Legal Ford 5.0 head with screw in studs
 

So, under this assumption, the Chevy Big Blocks would be illegal by using the 9/16" studs???

Re: Legal Ford 5.0 head with screw in studs
 

Thanks for your input guys. I appreciate it!

Re: Legal Ford 5.0 head with screw in studs
 

I've asked Bruce for clarification on this.

Re: Legal Ford 5.0 head with screw in studs
 

Very interested in what his response will be.

Re: Legal Ford 5.0 head with screw in studs
 

how do you adjust the stem sweep position with the pedestal setup? It's up a little higher than I want it to be and i can't lower the rocker anymore and pushrod length has nothing to do with it on the pedestal setup. I am using the comp cams 1052 rockers.

Re: Legal Ford 5.0 head with screw in studs
 

This issue has been brought up too many times and it keeps coming back.

Ford is not the only make that has switched to guide plates and studs under the rule changes that have taken place.

The current rules are as follows:

CAMSHAFT/LIFTERS
Pushrod guide plates permitted.

CYLINDER HEADS
The following are permitted: polylocks, jam nuts, screw-in larger-diameter rocker studs or pinned studs, bronze wall valve guides.

ROCKER ARMS
OEM or OEM-type aftermarket rocker arm permitted. Aftermarket rocker arm must be identical to OEM.

In a nutshell, the rule book as printed and as it reads, you are allowed pushrod guide plates and screw-in larger diameter rocker with the OEM style rocker arms.

Ever since this rule was implemented, I have seen many makes of engines, Ford, Oldsmobile and others, go thru teardown with no problems.

I believe the confusion has started with the new rule allowing aftermarket roller rockers which reads they must have the same configuration as OEM.

Re: Legal Ford 5.0 head with screw in studs
 

SSDiv6 your last sentance is what I ask Pat about in Phoenix with the new roller rocker rule. He said ask Bruce which I still need to do, but just been to busy.

Re: Legal Ford 5.0 head with screw in studs
 

Like I said, the rule change allowing guideplates and larger studs was implemented years ago.

http://classracer.com/classforum/showthread.php?t=10993

Re: Legal Ford 5.0 head with screw in studs
 

Great input! Thanks. Bruce is reviewing this issue as we speak.

Re: Legal Ford 5.0 head with screw in studs
 

Who is the go to guy for a good set of heads

Re: Legal Ford 5.0 head with screw in studs
 

Jim Kuntz

Re: Legal Ford 5.0 head with screw in studs
 

Is Bruce still reviewing this for you? Love to know what the ruling will be this time.