Head Studs, Rebuild Questions
Senior User
Joined: Apr 2004
Posts: 113
Likes: 0
From: Gadsden,Al
nobody makes head studs for teh 7.3L other than Ken At DPS(there are 2 so make sure you get teh right one).ARP only makes a stud kit for the 6.9L.They are nice but not strong enough for me.Only 190Klbs tensil.I like Kens stuff best.His 7.3L set is 270K Lbs I think.Or to put it another way,the studs will RIP CHUNKS outta the block before they stretch or break.Which is the way I like it since I am a Power *****.MORE POWER MORE POWER.500+ Horsepower is very obtainable from a lowely Mechanically injected Ford IDI without the use of Major drugs.Now if you wanted to use Drugs you can bump these engine to well over 600-700HP.Wouldn't be a long lived engine(100K) but would go.
Stage 3 Pump and sewer Pipe injectors
LOW compression
BIG boost numbers
Stiff valve springs for higher RPM
Pane
W/W injection
Funny Fuel
and a few more top secret internal stuff........
Stage 3 Pump and sewer Pipe injectors
LOW compression
BIG boost numbers
Stiff valve springs for higher RPM
Pane
W/W injection
Funny Fuel
and a few more top secret internal stuff........
Elder User
Joined: Apr 2006
Posts: 894
Likes: 0
From: South Dakota
Originally Posted by Freighttrain
nobody makes head studs for teh 7.3L other than Ken At DPS(there are 2 so make sure you get teh right one).ARP only makes a stud kit for the 6.9L.They are nice but not strong enough for me.Only 190Klbs tensil.I like Kens stuff best.His 7.3L set is 270K Lbs I think.Or to put it another way,the studs will RIP CHUNKS outta the block before they stretch or break.Which is the way I like it since I am a Power *****.MORE POWER MORE POWER.500+ Horsepower is very obtainable from a lowely Mechanically injected Ford IDI without the use of Major drugs.Now if you wanted to use Drugs you can bump these engine to well over 600-700HP.Wouldn't be a long lived engine(100K) but would go.
Last edited by Dave7.3; Jan 30, 2007 at 01:02 PM.
Junior User
Joined: Mar 2006
Posts: 62
Likes: 0
From: Princeton, AL
Originally Posted by Dave7.3
Those 7.3 studs are Powerstroke studs.
Edit button beat me!
Elder User
Joined: Apr 2006
Posts: 894
Likes: 0
From: South Dakota
Originally Posted by tuckerd1
Dave,
Those 7.3 studs are Powerstroke studs.
Edit button beat me!
Those 7.3 studs are Powerstroke studs.
Edit button beat me!
Posting Guru
Joined: Mar 2005
Posts: 1,701
Likes: 0
From: KY
Originally Posted by silver350
I'm having trouble finding a headstud kit for the 7.3, how long do the studs need to be? I'm suprised that they're course thread...
Also the head bolts like for a 6.9 aren't actually 7/16 bolts. The shank is smaller to allow for the head to move. Head bolts are like this on most engine for this reason....
I am curious as to how a head bolt out of a 6.9 compares to a real 7/16 bolt. Tensil and shear strength. I will test them and find out...
Senior User
Joined: Jan 2007
Posts: 167
Likes: 0
anyone ever use healy coils? I dont think I spelled that right but from what I was told back in the day is that they are always stronger than regular threaded in studs and that's what the best machine shop in my town that I grew up in in north NJ would use on their drag racing motors pushing over 1000hp, they would use them if the threads didn't need a repair or not on the entire block...
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
The little paper in my box of ARP head studs listed three different parts numbers for three different strength studs that fit the 6.9.
I do remember the 220,000 pound listing which is what my number was.
There was a 190,000 pound listing.
And I don't remember the other listing.
Not sure if that paper is still in the garage or not.
If I remember right the 6.9 studs also are the same size as a Chevy gas engine, 350 I think it was.
Head bolts listed for the 6.9 IDI are 7/16" 14 UNC 5.25" long
Head bolts listed for the 7.3 IDI are 1/2" 13 UNC 6" long
Although I did not measure the studs while out of the engine, I would guess the length to be 6".
With the stud bottomed out in the block against the shoulder at the top of the threads, there was about 3/4" of stud protruding through the head.
The ARP studs have larger bolt shanks, just like a standard bolt would.
The head bolts had a much smaller diameter shank in relation to the thread diameter.
I do remember the 220,000 pound listing which is what my number was.
There was a 190,000 pound listing.
And I don't remember the other listing.
Not sure if that paper is still in the garage or not.
If I remember right the 6.9 studs also are the same size as a Chevy gas engine, 350 I think it was.
Head bolts listed for the 6.9 IDI are 7/16" 14 UNC 5.25" long
Head bolts listed for the 7.3 IDI are 1/2" 13 UNC 6" long
Although I did not measure the studs while out of the engine, I would guess the length to be 6".
With the stud bottomed out in the block against the shoulder at the top of the threads, there was about 3/4" of stud protruding through the head.
The ARP studs have larger bolt shanks, just like a standard bolt would.
The head bolts had a much smaller diameter shank in relation to the thread diameter.
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