rocker nuts
Senior User
Joined: Dec 2001
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rocker nuts
If you indeed have brand new rocker nuts and they won't hold, sounds like you need new studs. To be sure about this, you could go get 1 from NAPA and test it against one of your old ones by sticking it in a vise. See if it takes more torque to spin on the nut than the ones in your head. You wouldn't want to use loctite on these, anyway.
If (I should say WHEN) you determine that you need new rocker studs, you'll need to visit the machinist - as long as you're there, you might as well install screw-in studs. That'll be around $60 labor (my machinist just quoted me "about" $5 a hole) plus parts. Not a real big deal.
If (I should say WHEN) you determine that you need new rocker studs, you'll need to visit the machinist - as long as you're there, you might as well install screw-in studs. That'll be around $60 labor (my machinist just quoted me "about" $5 a hole) plus parts. Not a real big deal.
Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
rocker nuts
What year motor? Some of these you torque down tight others are interferene nuts that are used to make the adjustments. You can buy the interference nuts new and that should help. They used these on the early models somewhere in the 70's they changed to the one you just torque to approx. 20 ft lbs. then in the later 80's they went to pedestal mounted rockers.
Post Fiend
Joined: Jan 2000
Posts: 5,860
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From: Metro Detroit (Redford)
rocker nuts
I had a '77 300 I6 that always would back off the rocker nuts. Once the nut came all the way off while I was driving and I was running on five cylinders. Seems in '78 or '79 Ford corrected that problem. I will try to look up what they did and get back tomorrow
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INLINE SIX POWER!
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Junior User
Joined: Apr 2001
Posts: 59
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From: Woodlawn USA
rocker nuts
I'll have to check on the year of the engine since the 78 it's in had an 8cyl in it. I was afraid it would be the studs but really did'nt want to hear that, oh well it needs rebuilt anyway, thanks
Post Fiend
Joined: Jan 2000
Posts: 5,860
Likes: 4
From: Metro Detroit (Redford)
rocker nuts
Just for the record, here is what I copied out of the 1979 Ford engine manual for the 300 I6:
"Positive stop rocker arm studs were added during 1978."
and "The positive stop rocker arm studs eliminates the necessity of adjusting valve clearance."
I am just thinking whatever this positive stop thing is maybe eliminated the problem of rocker nuts backing off.
"Drive a stick young man! There'll be plenty of time for automatics when you're old and unable."
"Positive stop rocker arm studs were added during 1978."
and "The positive stop rocker arm studs eliminates the necessity of adjusting valve clearance."
I am just thinking whatever this positive stop thing is maybe eliminated the problem of rocker nuts backing off.
"Drive a stick young man! There'll be plenty of time for automatics when you're old and unable."
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Junior User
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From: Woodlawn USA
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Junior User
Joined: Apr 2001
Posts: 59
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From: Woodlawn USA
rocker nuts
:-X11 does anyone know about what size cobustion chamber the 240 has? I want to rebuild this 300 and make it into a sleeper sorta to say but need to find out a few things like if the offy 4brl intake will bolt to the smaller 240cid head or if will have to get a differnt one. and if so who offers one for the 240? but if it will bring my compression up I'll do it.But the way I figure it if indeed the haed will work and raise my compression up run around a 270 cam have the head ported and polished run some forged flat tops at .040 over.Hd crank turned and balanced.Header and about a two and a half inch exchuast.With an after market ignition.(any sug.on the ignition)It will be backed by a c4 tranny with a 2500rpm stall convertor then into the 9inch with a set of 4-10 gears with a minispool!!!!!!!So any info on this project would be great sorry that this is so long but I look at it like this if you know what im trying to put together the better you can help right 
Senior User
Joined: Dec 2001
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rocker nuts
The 240 heads varied in chamber volume - my book is at the other garage so I can't look up the info, but I remember there is a 240 head, '67 I think (look for a C7 cast) that had the highest compression, 9.5:1.
300 EFI heads are another option, I think but I am not sure that they have smaller chambers.
Offy and Clifford intakes are the same for the 240.
Be careful if you are putting a 240 head on a 300 and you run flat top pistons, you are going to be around 11.5:1. Not good for street gas.
A Pertronix with a 40,000 volt coil will make a really big difference for the money - and you can always add and MSD box.
I am not sure why you would run such a high gear and a spool, that's a lot of dough, and drag race only kind of stuff. What are you using your truck for?
300 EFI heads are another option, I think but I am not sure that they have smaller chambers.
Offy and Clifford intakes are the same for the 240.
Be careful if you are putting a 240 head on a 300 and you run flat top pistons, you are going to be around 11.5:1. Not good for street gas.
A Pertronix with a 40,000 volt coil will make a really big difference for the money - and you can always add and MSD box.
I am not sure why you would run such a high gear and a spool, that's a lot of dough, and drag race only kind of stuff. What are you using your truck for?
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Junior User
Joined: Apr 2001
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From: Woodlawn USA
rocker nuts
i am useing the truck for!! Well lets just say an eye turner when its finshed.I would like to have this thing up and running before the end of summer.Pluse i would like to spank a few loud and go knowhere chevy's thats around here.It makes me sick that they put so much money into them and when they get on them its all noise and still takes off like a turtle.I was thinking about takeing it down the locale dragstrip a few times just to see what she'd run thats the main reason for such a low geared rear end!! pluse it's just going to be A weekend driver. Not to concerned about the fuel my truck dont like pump gas as it is thanks for the help though any more would be graet 
New User
Joined: Jul 2001
Posts: 4
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rocker nuts
A question on the valve lash adjustment. I have rebuilt a 300. The block is out of an '81 not sure about the head though. When I am adjusting the valve lash, I run out of threads on the mounting stud. Did I understand someone correctly to torque this to 20 ft/lbs? Also how do I determine the year of the head to see if it is newer than 78?
THanks.
THanks.