Stock valve spring question
Thread Starter
Dig
Joined: Jan 2006
Posts: 5,466
Likes: 1,126
From: Port Saint Lucie FLORIDA & HONDURAS
Stock valve spring question
Are 1997 - 2004 stock valve springs, retainers etc. the same ( interchangable) ?
I just hit my 275 shot of nitrous on the street and bent all my pushrods except 2 and my valvesprings are stock w/ 120,000 + miles on them. So, i think it's time to change them !!!
I want to know about "stock" valve springs only. I am trying for the fastest nitroused completly stock motored vette.
Thanks
btw-i have a 97 c5
I just hit my 275 shot of nitrous on the street and bent all my pushrods except 2 and my valvesprings are stock w/ 120,000 + miles on them. So, i think it's time to change them !!!
I want to know about "stock" valve springs only. I am trying for the fastest nitroused completly stock motored vette.
Thanks
btw-i have a 97 c5
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
There have been a few different versions of the stock valve spring. If you want to stay with GM stock, I would consider the LS6 valve springs. They are slightly stiffer than the LS1 version and a set is around $55 form the forum GM parts vendors. I just rebuilt my stock heads using these springs.
Le Mans Master
Joined: Dec 2000
Posts: 9,900
Likes: 1,840
From: Hot Springs AR
Yes, I swapped out my LS-1 springs this last winter after 148,xxx miles and went with the yellow LS-6/LS-2 springs. They've worked just fine with the LS-1 retainers, seats, etc.
BTW, spend the money to get the Crane Cams LS-1 valve spring compressor. I tried three different types of tools before I got this compressor; well worth the $120 or so it cost.
HTH, and have a good one,
Mike
BTW, spend the money to get the Crane Cams LS-1 valve spring compressor. I tried three different types of tools before I got this compressor; well worth the $120 or so it cost.
HTH, and have a good one,
Mike
Drifting
Joined: Dec 2005
Posts: 1,720
Likes: 3
From: East Hampton CT
Are you revving past the stock redline? How the heck are you bending pushrods with stock rpms? I know springs get worn and won't follow the cam properly at high rpm, but I don't see how that can bend pushrods....just an observation.
If all your pushrods are bent, I'm guessing there was a "piston-valve event". Have you investigated your engine internals for damage?
If all your pushrods are bent, I'm guessing there was a "piston-valve event". Have you investigated your engine internals for damage?
Thread Starter
Dig
Joined: Jan 2006
Posts: 5,466
Likes: 1,126
From: Port Saint Lucie FLORIDA & HONDURAS
My car shift at 6200 rpm's. My rev limiter is set for 6500.
What happened was i hit the limiter manually shifting the car w/ my nitrous. I was testing some things... that's why i was manually shifting my A4
What happened was i hit the limiter manually shifting the car w/ my nitrous. I was testing some things... that's why i was manually shifting my A4
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Drifting
Joined: Dec 2005
Posts: 1,720
Likes: 3
From: East Hampton CT
I guess you're trying to prove something by aiming for the "fastest stock motored vette" but I'd at least put some serious valve springs on there to protect the engine from over-revving situations. JMO.
Thread Starter
Dig
Joined: Jan 2006
Posts: 5,466
Likes: 1,126
From: Port Saint Lucie FLORIDA & HONDURAS
Well, i need to put stock springs in to keep it "stock".
I managed to burn up 2 tr6 plugs too. And of course, i had to break a spark plug wire taking it off !!
The 2 plugs that i burnt/melted were on the cylinders that had the worst bent pushrods.
I managed to burn up 2 tr6 plugs too. And of course, i had to break a spark plug wire taking it off !!
The 2 plugs that i burnt/melted were on the cylinders that had the worst bent pushrods.
Former Vendor
Joined: Mar 2004
Posts: 1,518
Likes: 7
From: Valencia CA
If I were you I would do a leakdown on every hole. The chance that you didn't actually bend one of those valves is slim to none. If its bent more than a little your going to know about it with a leakdown test (the bent valve wont seal and the leakdown will be horrible). More than likely the bent valves would have been the first ones to hit with more force before the RPM's came down, but any and all of them could be tweaked if you hit the piston hard enough to bend your pushrods.
Obviously if you do have some bent valves your power will be down if you try to run it that way.
The only chance you have of not bending the valves is the fact the factory pushrods arent as strong as an aftermarket but neither are the factory valves when compared to the aftermarket so its still a crapshoot. Do a leakdown test....its a must considering what you just experienced.
Tony
PS....I see a forged shortblock in your near future....LOL
Last edited by Tony Mamo @ AFR; Jul 17, 2007 at 11:55 AM.
Thread Starter
Dig
Joined: Jan 2006
Posts: 5,466
Likes: 1,126
From: Port Saint Lucie FLORIDA & HONDURAS
Thanks. Right now i'm trying to figure it all out. Funny part is Wed. i was supposed to be in Tampa meeting Brad@TheCorvetteShow !!
I can't make it over there right now.
I can't make it over there right now.
Le Mans Master
Joined: Aug 2001
Posts: 8,145
Likes: 1
From: Bradenton FLORIDA
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody