Absolute limit of stock rockers.
Absolute limit of stock rockers. I want to know:
What RPM have they been successfully revved to?
What type of cam/lobe have you successfully run with them?
How much total lift have they handled?
I don't want to hear what you read. I want to hear what you've done.
What RPM have they been successfully revved to?
What type of cam/lobe have you successfully run with them?
How much total lift have they handled?
I don't want to hear what you read. I want to hear what you've done.
I did. That's what got me thinking. BUT he has a stock lift cam/lobes correct? His RPMs may be higher than normal, but I've never seen that posted. Also, he has a dedicated 1/8th mile race car. Very short bursts if anything.
Yeah, purpose-built.
I think anyone running serious RPMs or a serious cam would certainly have no reason to run stock rockers. The more lift on the cam, the more friction on the rocker tip, resulting in lost HP, higher oil temperatures, and increased oil foaming.
I think anyone running serious RPMs or a serious cam would certainly have no reason to run stock rockers. The more lift on the cam, the more friction on the rocker tip, resulting in lost HP, higher oil temperatures, and increased oil foaming.
The stock rockers that I run on my Stocker have been modified to work with a 7/16" stud. They have also been coated. Valve spring pressure is right around 400 lbs (open). I have never broken one. The kids car uses untouched stock rockers and studs.
I wouldn't run stock rockers if I didn't have to. I would skip over the more common stuff used on here and go straight to shaft mounts.
Contrary to popular belief, I have been down the quarter mile once or twice too!
I wouldn't run stock rockers if I didn't have to. I would skip over the more common stuff used on here and go straight to shaft mounts.
Contrary to popular belief, I have been down the quarter mile once or twice too!
Anyone that runs this class of racing has plenty experience and or has been around those that has....
Thank you Gizmo for the updates,pictures etc. I feel you have shown alot of our members here the Lt1 is and always has been a competitive.
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The stock rockers that I run on my Stocker have been modified to work with a 7/16" stud. They have also been coated. Valve spring pressure is right around 400 lbs (open). I have never broken one. The kids car uses untouched stock rockers and studs.
I wouldn't run stock rockers if I didn't have to. I would skip over the more common stuff used on here and go straight to shaft mounts.
Contrary to popular belief, I have been down the quarter mile once or twice too!
I wouldn't run stock rockers if I didn't have to. I would skip over the more common stuff used on here and go straight to shaft mounts.
Contrary to popular belief, I have been down the quarter mile once or twice too!
Last edited by LSWHO; Aug 2, 2010 at 03:25 PM.
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Verdad Gallardo We shift the kids car at 5400 rpm and it traps a little over 6000 rpm. In the quarter those modified rockers see 7200-7500. I ran box stock rockers for years past 7000 and never had a failure. The reason for the 7/16" studs is reduced flex, which means a few extra HP.
The flex and geometry will hurt you. I wouldn't go past .550 lift if you're looking for some longevity out of your valve guides. I've run em with 918s, about 140/340 and they did fine for the 2000 miles I had them on there. Keep in mind that flex is NOT what you want in your valvetrain.
The flex and geometry will hurt you. I wouldn't go past .550 lift if you're looking for some longevity out of your valve guides. I've run em with 918s, about 140/340 and they did fine for the 2000 miles I had them on there. Keep in mind that flex is NOT what you want in your valvetrain.
I am thinking of getting some split ratio (1.5i/1.6e) magnums. Not pro-mags. Until I can dump considerable amount more into the valvetrain...
The cam isn't going to "spear" a stock rocker, the pressure the spring is exerting might. LT4 springs run ~330lbs/in and GM uses them with stamped rocker arms in their crate motors.
TECH Regular
Joined: Apr 2007
Posts: 420
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From: Kempner, TX
At least one of the manuals I have mention the possibility of a pushrod(s) punching through a stock rocker arm's pushrod cup.
My take on this: stock rockers, stock springs adhere to the factory redline. Aftermarket cam/springs go with aftermarket RRs.
Jake
My take on this: stock rockers, stock springs adhere to the factory redline. Aftermarket cam/springs go with aftermarket RRs.
Jake
