Bended push rod and broken spring valve
Thread Starter
Instructor
Joined: Mar 2003
Posts: 124
Likes: 0
From: Irvine CA
Bended push rod and broken spring valve
Hi all,
I have a C5 MN-6 that is producing approximately 500HP (see below signature for mods) at the flywheel. During one of the rides the Vette started to produce this fast metallic noise and some exhaust smoke, I stopped and we tow it back to my garage. After removing the header cover I could see that one of the push rods was sticking out pass the rocker and the spring valve for the same rocker was broken in a half.
My question is ... given the amount of HP that I am running, which push rod/spring valve kit would you recommend so I don't have to deal with this issue again? Also, if you have an indicator for $$$'s, that would be great.
Thanks for your help. M.
I have a C5 MN-6 that is producing approximately 500HP (see below signature for mods) at the flywheel. During one of the rides the Vette started to produce this fast metallic noise and some exhaust smoke, I stopped and we tow it back to my garage. After removing the header cover I could see that one of the push rods was sticking out pass the rocker and the spring valve for the same rocker was broken in a half.
My question is ... given the amount of HP that I am running, which push rod/spring valve kit would you recommend so I don't have to deal with this issue again? Also, if you have an indicator for $$$'s, that would be great.
Thanks for your help. M.
Drifting
Joined: May 2003
Posts: 1,715
Likes: 1
From: cAshburn VA
Original Cartek Stage 2 valve springs (proprietary, whatever) were rated for .580 lift, so...
Cheap version
CompCam 918 valve springs, $170 springs alone, 250-300 kit. Rated to .600 lift
(Just about everybody carries these)
Expensive version (do it once!):
CompCam 921 dual valve springs- $560 kit including spring seats, titanium retainers and valve locks. Rated to .650 lift.
(Thunder Racing carries these, at that price)
Now, both of these are made to fit the stock LS1/LS6 heads. I do not know if the Cartek heads were machined to accept a different spring, or if they were, if it is an issue. You should give the guys over at Cartek a call on this.
I would definately go with the dual springs. If you break a spring again in the future, chances are it would only be one, and the other would save the collateral damage.
If you are running stock rockers, might be a good time to throw a set of yella terra roller rockers on, or comp is good too. Maybe even a set of 1.75s if you go with the 921 springs.
Disclaimer: Not an expert, just my $.02. Nothing bad to say about Manleys and Iskey's they are good springs also.
Let us know how it works out, and Good Luck!
Forgot to add, though you were probably going to do this anyway, pull and check all those pushrods while you are in there!
Cheap version
CompCam 918 valve springs, $170 springs alone, 250-300 kit. Rated to .600 lift
(Just about everybody carries these)
Expensive version (do it once!):
CompCam 921 dual valve springs- $560 kit including spring seats, titanium retainers and valve locks. Rated to .650 lift.
(Thunder Racing carries these, at that price)
Now, both of these are made to fit the stock LS1/LS6 heads. I do not know if the Cartek heads were machined to accept a different spring, or if they were, if it is an issue. You should give the guys over at Cartek a call on this.
I would definately go with the dual springs. If you break a spring again in the future, chances are it would only be one, and the other would save the collateral damage.
If you are running stock rockers, might be a good time to throw a set of yella terra roller rockers on, or comp is good too. Maybe even a set of 1.75s if you go with the 921 springs.
Disclaimer: Not an expert, just my $.02. Nothing bad to say about Manleys and Iskey's they are good springs also.
Let us know how it works out, and Good Luck!
Forgot to add, though you were probably going to do this anyway, pull and check all those pushrods while you are in there!
Last edited by IFLUBYU; Jul 15, 2004 at 11:54 PM.
Thread Starter
Instructor
Joined: Mar 2003
Posts: 124
Likes: 0
From: Irvine CA
Bended pushrod and broken spring valve
Originally Posted by IFLUBYU
Forgot to add, though you were probably going to do this anyway, pull and check all those pushrods while you are in there!
I appreciate all of your advice. M.
Advanced
Joined: Jul 2004
Posts: 58
Likes: 0
From: CA
Listen Bro!
Don't mess w/ anything but Isky TOOL ROOM There are no better LS1 Springs out there! We have tried them all Comp, Crane, REV,
you name it. Theese are the only springs that have lived on our shop 99FRC 540rwhp @7000+rpm, $625 you get springs, locks, shims, and very nice Titainium retainers. After 100+ passes less than 2lbs loss on any!!!!!
Don't mess w/ anything but Isky TOOL ROOM There are no better LS1 Springs out there! We have tried them all Comp, Crane, REV,
you name it. Theese are the only springs that have lived on our shop 99FRC 540rwhp @7000+rpm, $625 you get springs, locks, shims, and very nice Titainium retainers. After 100+ passes less than 2lbs loss on any!!!!!
Heel & Toe
Joined: Mar 2004
Posts: 16
Likes: 0
From: Orlando Florida
We have a dual spring kit with titanium retainers and spring inserts for up to .650 lift and we also have 1.7 and 1.8 roller rocker packages (depends on your lift #s) that include rockers, studs, guideplates, and polylocks. Give us a call at 1-866-462-4500 or look up the parts on our website. Hope this helps. Joe
