nitried or cryo

larry asa · 11-25-2008, 10:50 PM

I'am having rocker arm problems. Which has shone results?? Ideas??
Thanks Larry

Alan Roehrich · 11-25-2008, 11:02 PM

Rocker problems on what?

Bill Harris · 11-26-2008, 12:40 AM

I used to break rocker arms on my FoMoCo 429 stocker every five or six runs, always an intake (2.25" monster). Had a brand new set of NOS rockers and fulcums cyro'ed three years ago, haven't broken one since. Might also be due to increased spring pressure/shubecks/smith pushrods, but it's worth a shot. Your mileage might vary.

larry asa · 11-28-2008, 10:48 PM

Alan: I have everthing that clark makes. I think Kevin and Jim are close to the problem. I have never had any rocker arm problem before going to the 427. Now I have destroyed 2 motors this year.due to rocker arms and Schubeck lifters.
Thanks for every ones help.
Larry 2206 A/SA
PS Jim you got mail

Alan Roehrich · 11-29-2008, 10:07 AM

Larry,
I am Kevin's engine builder. The only thing we've ever broken was a stud, and that was before we bought the stuff from Clark. We've never had anything but a 427. If you want, send me a PM or an email with some pics. I can probably help you.

larry asa · 11-26-2008, 12:52 AM

Quote:

Originally Posted by Alan Roehrich

Rocker problems on what?

Chevy 427

Thanks Bill

John Musial · 11-26-2008, 09:18 AM

Larry, give Jim Bailey a call. www. finishedracing.com He will point you in the right direction.

Stick Racing · 11-26-2008, 06:47 PM

Crane Nitro Carb rockers cryo'ed.

They have worked very well for me. It's a good idea to run them for 3-400 runs and recycle them. Much like all valve train pieces, they need to be replaced after x amount of runs.

Andy Stone B/S 1102 SS/C 1112

Jim Bailey · 11-27-2008, 10:33 AM

Larry, call Wes McCracken, John Musial, Charlie Weber, Charlie Downing, Chuck Beach, Bob Marshall, Brian Seibenick and see what they have to say. OR save some time and just give me a call. Keep in mind, nitried is a surface treatment. Cryo treats the entire part. Also, not all Cryogenic Processing is created equal. 330-858-1842. JB.

Alan Roehrich · 11-27-2008, 10:54 AM

Quote:

Originally Posted by larry asa

Chevy 427

Thanks Bill

Larry,
We run the stuff from Clark Holroyd, and have since 2006. We bought a complete setup, and have not broken a single rocker since. We are going to finally break down and put a new set of rockers on this Winter. I'm running 265# on the seat, and 550# open pressure. We turn as much as 7800 RPM, and make probably 100-150 passes a year, plus dyno time. Clark's stuff is just plain GM.

Are you fully deburring your rockers?

Where are they breaking?

11-25-2008, 10:50 PM	#1
larry asa Junior Member Join Date: Jul 2007 Posts: 23 Likes: 0 Liked 0 Times in 0 Posts	nitried or cryo I'am having rocker arm problems. Which has shone results?? Ideas?? Thanks Larry

11-25-2008, 11:02 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,106 Likes: 1,564 Liked 1,789 Times in 408 Posts	Re: nitried or cryo Rocker problems on what? __________________ Alan Roehrich 212A G/S

11-26-2008, 12:40 AM	#3
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	Re: nitried or cryo I used to break rocker arms on my FoMoCo 429 stocker every five or six runs, always an intake (2.25" monster). Had a brand new set of NOS rockers and fulcums cyro'ed three years ago, haven't broken one since. Might also be due to increased spring pressure/shubecks/smith pushrods, but it's worth a shot. Your mileage might vary. __________________ Bill Harris ex 2172 STK ex 2272 S/S

11-28-2008, 10:48 PM	#4
larry asa Junior Member Join Date: Jul 2007 Posts: 23 Likes: 0 Liked 0 Times in 0 Posts	Re: nitried or cryo Alan: I have everthing that clark makes. I think Kevin and Jim are close to the problem. I have never had any rocker arm problem before going to the 427. Now I have destroyed 2 motors this year.due to rocker arms and Schubeck lifters. Thanks for every ones help. Larry 2206 A/SA PS Jim you got mail Last edited by larry asa; 11-29-2008 at 12:57 AM.

11-29-2008, 10:07 AM	#5
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,106 Likes: 1,564 Liked 1,789 Times in 408 Posts	Re: nitried or cryo Larry, I am Kevin's engine builder. The only thing we've ever broken was a stud, and that was before we bought the stuff from Clark. We've never had anything but a 427. If you want, send me a PM or an email with some pics. I can probably help you. __________________ Alan Roehrich 212A G/S

11-26-2008, 09:18 AM	#7
John Musial Junior Member Join Date: Dec 2005 Location: Comfort Texas Posts: 93 Likes: 82 Liked 51 Times in 3 Posts	Re: nitried or cryo Larry, give Jim Bailey a call. www. finishedracing.com He will point you in the right direction.

11-26-2008, 06:47 PM	#8
Stick Racing Member Join Date: Mar 2007 Posts: 169 Likes: 4 Liked 0 Times in 0 Posts	Re: nitried or cryo Crane Nitro Carb rockers cryo'ed. They have worked very well for me. It's a good idea to run them for 3-400 runs and recycle them. Much like all valve train pieces, they need to be replaced after x amount of runs. Andy Stone B/S 1102 SS/C 1112

11-27-2008, 10:33 AM	#9
Jim Bailey Senior Member Join Date: Aug 2004 Posts: 674 Likes: 15 Liked 584 Times in 94 Posts	Re: nitried or cryo Larry, call Wes McCracken, John Musial, Charlie Weber, Charlie Downing, Chuck Beach, Bob Marshall, Brian Seibenick and see what they have to say. OR save some time and just give me a call. Keep in mind, nitried is a surface treatment. Cryo treats the entire part. Also, not all Cryogenic Processing is created equal. 330-858-1842. JB.