0.650" lift on stock rockers, pictures!!!
[QUOTE=LS1-450;18397681]Was looking @ that the other day. Stock rockers produce a wide contact patch. Looking @ the bottom photo where the camera is further from the valve tip, the pattern looks centered.[/QUOTE
it looked wide but centered when i was setting it up on the bench. i was told the wide part was unavoidable on stock rockers so i went with it
it looked wide but centered when i was setting it up on the bench. i was told the wide part was unavoidable on stock rockers so i went with it
IMO, we need to keep in mind that TurboBuick6's valve train was well though out. Not just haphazardly thrown together with a random mix of parts. His results show what's possible, NOT what the norm is.
So, I would still stick with the experts(many which are sponsors) on their maximum lift recommendation when using stock rockers. Furthermore this is especially important with more expensive aftermarket heads that normally use softer bronze valve guides.
TurboBuick6 , keep us posted on how well the valve guide have held up!
So, I would still stick with the experts(many which are sponsors) on their maximum lift recommendation when using stock rockers. Furthermore this is especially important with more expensive aftermarket heads that normally use softer bronze valve guides.
TurboBuick6 , keep us posted on how well the valve guide have held up!
Curious how the wipe looked after the milling? Hard to tell from photos, but it does look offset to the outside based on what can be seen but that also might show that way since max lift is max force.
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I see two pretty distinct contact areas.... one thats pretty wide... and then that narrower lighter looking area toward the bottom of the valve in the first pic...
And that area looks pretty damn rough...like what happens when the rocker just has the very outter edge in contact with the valve tip.... like it does when you go over .640 lift or so...
Take some better pics... use a flash.... most cell phones have one these days.
And that area looks pretty damn rough...like what happens when the rocker just has the very outter edge in contact with the valve tip.... like it does when you go over .640 lift or so...
Take some better pics... use a flash.... most cell phones have one these days.
I have several customers who run .650"ish lift with our springs and stock rockers with no issues.
It's not that it won't work, it just doesn't work well 100% of the time...
I've seen a valve tip get trashed on a stock LS6 cam because the guy didn't change his oil.
To think that you can run .650" lift with stock rockers and never have a issue just isn't reality.
Thanks for the update Matt, please post pics of the rocker scroll if you get a chance.
It's not that it won't work, it just doesn't work well 100% of the time...
I've seen a valve tip get trashed on a stock LS6 cam because the guy didn't change his oil.
To think that you can run .650" lift with stock rockers and never have a issue just isn't reality.
Thanks for the update Matt, please post pics of the rocker scroll if you get a chance.
without the milling it was heavily exhaust biased to the point it was on the edge of the tip. after milling it was just off center favoring the exhaust side
The problem with roller rockers and aftermarket lobes is they are a pain in the *** to control. Whereas you experience smoothness in the upper RPM with mild stock lobes, a lot of folks experience valvetrain instability. The solution is to continue throwing more and more spring pressure at it to control the weight and jerk characteristics of the combo, and at some point, you either stress the rocker, pushrod, or lifter too much and end up creating friction issues from excess spring pressure or something breaks (like the rocker).
The solution is of course a well-engineered combo. But most folks throw tiny pushrods, LS7 lifters, and heavy roller rockers at something with LSL or LSK lobes and hope for the best...
The solution is of course a well-engineered combo. But most folks throw tiny pushrods, LS7 lifters, and heavy roller rockers at something with LSL or LSK lobes and hope for the best...
Roller rockers are not a pain in the *** to control.........it's why the car runs smoother at high rpm. That means more control. The problem with ALOT of builds I see is spring pressure...... To much of it for a hydraulic cam. The fix these days are beehive or conical springs, TI retainers and light valves. That's where the control comes from......not more spring. You know.....the **** most don't want to spend the extra money on.
Hey op......what rpm and what power is that thing doin?
Last edited by HioSSilver; Aug 30, 2014 at 08:13 AM.
Curious if you have any photos of the final wipe. Also, what stands did you use to mill, the steel LPE version?
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Just got the heads back from getting a valve job and freshen up. No need to replace the guides because everything looks great.
Once I get everything bolted back up I will get some video of the wipe pattern for everyone, don't expect it for a few weeks, need to order a new cam still.
Once I get everything bolted back up I will get some video of the wipe pattern for everyone, don't expect it for a few weeks, need to order a new cam still.
Turbobuick6 ....why you changing cams ?
that stick I believe was .651 on both int/exh, you were way over the magical threshold.
the stands he milled were stock pieces FYI
.649 .651. don't like the way the nose looks on #1 Intake.
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Ever seen a Cam Doctor graph of one?
