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Author Topic:   Center head bolt problem w/1.550 Springs
Dirt Freak

Total posts: 385
posted May 01, 2005 08:06 PM  
OK - I'm putting the new heads together - they're Dart Iron Eagle's and I've got 1.550 springs for a roller cam. I've got head studs with the standard 6-point nuts, I can get the center nut on the stud, but I can't get the socket to clear the 2 valvesprings to torque them.

What does everyone do on this one? Surely I'm not the only one to run into this one??

There are only 2 things that I can think of to do - first is to drive the socket past the springs, but that would probably mess up the torque readings, and the other is to put a bolt in the center with an allen head (socket head cap screw type) Anyone make such a bolt? ARP?

Dirt Forum Champ
Total posts: 578
posted May 01, 2005 08:11 PM  
remove the 2 springs and torque the heads...then reinstall the springs.
or grind a socket way down to clear the springs.


MOD 4s
Dirt Roller

Total posts: 17
posted May 01, 2005 08:19 PM  
get 12 point nuts they will take a smaller socket

Dirt Forum Champ
Total posts: 1261
posted May 01, 2005 10:34 PM  
The 12 point work just fine and you can get them 2 or 3 or 12 if you want.....i had to do that on my pro heads....

Dirt Freak

Total posts: 385
posted May 02, 2005 07:51 AM  
Thanks - Guess I'm on the lookout for a couple of the 12-point nuts... Hopefully the local speed shop carries them - otherwise it's going to be another week before this thing is together...

Anyone near Kansas City have a couple of the nuts??

Dirt Roller

Total posts: 6
posted May 02, 2005 10:58 AM  
Possibly try to find a thinner diameter socket of a differnt brand. Or use a 3/8 drive socket with 1/2 to 3/8 adapter (assuming you're using 1/2 drive torque wrench and socket.)

Dirt Forum Champ
Total posts: 2007
posted May 02, 2005 11:09 AM  
Ill look tonight, I have a few odds and ends of head parts in a box, I think they are all 6pt, but ill check I might have a few 12pt in there..

I would go with the 12 pt nut idea. They should be easy to find at a shop or at least have someone be able to get them in a day or two from a supplier here in town. You might look up and ARP part number for them and give O'reillys a call. Lots of times they can get stuff like that and if you call early enough they can sometimes get it by end of the day.

Teh other thing I would prob do is just assemble the head with the inner spring. put it on torque everything down then go back and put the outers on.

[This message has been edited by dirtbuster (edited May 02, 2005).]

Dirt Freak

Total posts: 385
posted May 02, 2005 03:01 PM  
novajohnb - I was trying my "thin" sockets - had a craftsman, an SK, and some generic - both 3/8 and 1/2" drive... None of them fit.

dirtbuster - Thanks for looking - let me know if you come up with something!

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