Visit The Dirt Forum for More Information

Author Topic:   rocker stud pinning
dode
Dirt Freak

Total posts: 417
posted March 25, 2003 09:39 PM UIN: 13209501
Is this something I should have the machine shop do? I would rather not mess up a head, and we already have one stud pulling out. How much should I expect to pay for this? Geez...if it isn't one thing or another.

John

Donnie Ross
Dirt Maniac

Total posts: 109
posted March 25, 2003 09:46 PM
buy the kit from speed way you can do it pretty easy just drill thruogh the center of the boss take your time dont force the bit then install the pin no prob.

sdhnc29
Dirt Freak

Total posts: 467
posted March 25, 2003 11:13 PM
Before you consider ruining your head's by doing this , consider have your head's machined for scr@w-in studs . If someone has this procedure done at my shop , the cost is $100 + stud's. I would never pin a rocker stud ! Compare this $100 + stud's to the cost of having them pinned , then having a stud break anyway , and then having the machine work done to repair the stud boss that has the broken off hardened factory stud inside of it ....... not to mention the main event you will lose when the pinned stud break's .

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780

dode
Dirt Freak

Total posts: 417
posted March 25, 2003 11:23 PM UIN: 13209501
Well, the problem is that by rule we can't run ***** in studs, otherwise I absolutely would install them.

John

mtwrght29
Dirt Full Roller

Total posts: 32
posted March 25, 2003 11:39 PM
i would not drill the center of the stud just makes them weak and they will break. I have seen pinned studs work when they are done properly by drilling just on the edge of the stud to where about half of the pin runs through the edge of the stud. serves its purpose keeps pin from pullin out and doesn't weaken the stud as much

ford5
Dirt Freak

Total posts: 298
posted March 26, 2003 06:17 AM
dode, did you receive my package?

outlawstock17
Dirt Forum Champ
Total posts: 620
posted March 26, 2003 08:04 AM
hey dode, there is a special s-crew in stud that doesn't have the big hex on it. once it's installed, it looks just like a stock press in stud. sdhnc29 is right.....i've seen a lot of pinned heads crack and break around the pins. if you pin them, they will be junk in no time.

dode
Dirt Freak

Total posts: 417
posted March 26, 2003 08:16 AM UIN: 13209501
anyone know where to get these studs?

John

ryan
Dirt Freak

Total posts: 430
posted March 26, 2003 09:32 PM

10 bucks midwest motorsports

[This message has been edited by ryan (edited March 26, 2003).]

o5racer
Dirt Maniac

Total posts: 115
posted March 27, 2003 10:13 PM
Word of advise. Be VERY VERY carefull on how tight you s crew those studs in. that little tapered shoulder will split the head right around the stud if you tighten it to much. Dont aske me how I know, just trust me.

ford5
Dirt Freak

Total posts: 298
posted March 28, 2003 06:20 AM
Also, make sure you put thread sealer of some type on those, as they willl leak water, if you don't.

enduro22@comcast.net
Dirt Newbie

Total posts: 1
posted March 29, 2003 07:45 AM
John, I have pinned studs with 1/8 roll pins through the center of stud for 15 years and NEVER had any problems. I tell my customers if they are .500 lift and 6500 RPM or less they will be fine. Over that and yes ***** ins are a must. 2 years ago COMP came out with new lobe profiles for lift rules and we had a breakage problem. The stock stud would break through the threaded portion right under the ball. Stock rockers and .420 lift. NEVER did the stud break anywhere else. New lift rule cams put tremendous bend loads on stock studs. I don't know if the studs w/out jam nut would give enough support to keep this from happening. I was able to get rules changed to allow regular screwins for durability reasons but w/out guideplates.Hope this helps. PS I charge 1 hour labor to pin. $68.

------------------
enduro22@comcast.net

Back to the Archives