Engine Roller Rocker Stud Size, GT40P heads

foxbodyclark · Jan 25, 2025

Trying to figure out whether I need 5/16, 3/8, or 7/16 stud size for Roller Rockers on GT40P heads. Been digging through old forums before I came here but I can't find a clear answer. Thanks.

85GTStangGuy · Jan 25, 2025

I thought those heads used pedestal mount rockers, not stud mount. If you're looking for the pedestal mount bolt, I believe they are 5/16-18 bolts.... but unsure on length.

89ripper · Jan 25, 2025

https://www.hotrod.com/how-to/how-to-upgrade-your-ford-gt40p-heads/

limp · Jan 25, 2025

Your going to put alot of money into these heads doing this.... I would opt for different rockers or get some aluminum heads that will not require all of this machine work that will contribute NOTHING to any performance gain..

I used some roller tip rockers on my " P " heads as I was going to change out my rockers not knowing how many quadzillion times they had gone up and down in their lives..... My reasoning is the roller tip helps prevent " sideways push" on the valves contributing to bore wear....

foxbodyclark · Jan 25, 2025

limp said:
Your going to put alot of money into these heads doing this.... I would opt for different rockers or get some aluminum heads that will not require all of this machine work that will contribute NOTHING to any performance gain..

I used some roller tip rockers on my " P " heads as I was going to change out my rockers not knowing how many quadzillion times they had gone up and down in their lives..... My reasoning is the roller tip helps prevent " sideways push" on the valves contributing to bore wear....

What rockers would you suggest? This topic is a bit out of my wheelhouse so I may have gotten terminology wrong.

limp · Jan 25, 2025

I am not the guy to ask about " which ones are best" ... I did what would work best for what I wanted.....
You don't have many options for bolt on except pedestal mount without spending alot on machine work " as far as I know"...
If you go down the path of alot of Hi Po parts on your stock P head, you will have more money into your P heads tham a nice set of aftermarket Aluminum heads that will perform better....

limp · Jan 25, 2025

What are you going to use this car for??

foxbodyclark · Jan 25, 2025

Weekend car, take on cruises and cars and coffee. Pulls and burnouts here and there.

AeroCoupe · Jan 25, 2025

You can run full roller rockets, roller tip rockers (not sure they are available anymore), or stock ones. How much wallet do you have and is 10 to 15 hp worth it?

Noobz347 · Jan 25, 2025

AeroCoupe said:
You can run full roller rockets, roller tip rockers (not sure they are available anymore), or stock ones. How much wallet do you have and is 10 to 15 hp worth it?

limp said:
Your going to put alot of money into these heads doing this...

Question: Aside from the cost of the roller rockers, what else has to be done to accommodate them on an otherwise, stock GT40 head?

Blackhawkxx · Jan 25, 2025

If the heads are pedestal mount, the Scorpions are nice and you can stay with 1.6 or go 1.72 like I did on my 85 GT when I had it.

https://lmr.com/item/SCP-1021/scorpion-rocker-arms-1-6-ratio-5-16-pedestal-mount-sbf

limp · Jan 26, 2025

foxbodyclark said:
Weekend car, take on cruises and cars and coffee. Pulls and burnouts here and there.

Put the stock rockers back on it... Your just throwing money away with anything else..

AeroCoupe · Jan 26, 2025

Take them to a machine shop and have the bosses milled down, drill and tap for rocker studs, buy the studs, buy the push rod guides, and then set it all up right.

Noobz347 · Jan 26, 2025

AeroCoupe said:
Take them to a machine shop and have the bosses milled down, drill and tap for rocker studs, buy the studs, buy the push rod guides, and then set it all up right.

If it were me, I'd probably go this direction but then I plan boost for just about everything I own.

2000xp8 · Jan 26, 2025

Crane used to make a pedestal to stud mount conversion kit. I had the kit at one time, but never used it and gave it to a friend.
Pretty sure this was it. https://www.summitracing.com/int/parts/crn-35655-16

Just buy a set of for racing or crane 1.6 or 1.7 pedestal rockers on facebook and shim them as necessary.
No chance I'm going past a valve job on gt40 iron anything, the money just doesn't make sense.
I had not seen that article listed above and while informative that's like $800 in parts and that doesn't include labor. Not to mention that is 2014 money.
You can buy afr enforcers for just a few more dollars.

Engine Roller Rocker Stud Size, GT40P heads

foxbodyclark

Member

85GTStangGuy

89ripper

limp

wrap a little cheese around it and its a done

foxbodyclark

Member

limp

wrap a little cheese around it and its a done

limp

wrap a little cheese around it and its a done

foxbodyclark

Member

AeroCoupe

lube between the nut and the face. I know my lubes

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

Blackhawkxx

Advanced Member

limp

wrap a little cheese around it and its a done

AeroCoupe

lube between the nut and the face. I know my lubes

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

2000xp8

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Engine Roller Rocker Stud Size, GT40P heads

Member

wrap a little cheese around it and its a done

Member

wrap a little cheese around it and its a done

wrap a little cheese around it and its a done

Member

lube between the nut and the face. I know my lubes

Stangnet Facilities Maint Tech... Er... Janitor

Advanced Member

wrap a little cheese around it and its a done

lube between the nut and the face. I know my lubes

Stangnet Facilities Maint Tech... Er... Janitor

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