How bad is this? (pic)
04-24-2006, 10:07 PM
#1
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How bad is this? (pic) This is with the valve at full lift...notice the location of the rocker tip on the valve...looks like it is resting on the valve edge. These are the 1.8 LS7 exhaust rockers....with these rockers, it puts my lift to around .560
Am I asking for trouble wearing out the edges on my valves?
TIA
Am I asking for trouble wearing out the edges on my valves?
TIA
04-24-2006, 11:24 PM
#6
Pushrod length affects geometry.
Remember, the LS7 heads require different pushrods vs the LS1/2/6, because it's an 11 degree head. The rockers sit offset to start with. Running a 7.4" length pushrod is fine for a 15 degree rocker, but you don't have that. You'll have to go with a shorter pushrod to correct the geometry.
Remember, the LS7 heads require different pushrods vs the LS1/2/6, because it's an 11 degree head. The rockers sit offset to start with. Running a 7.4" length pushrod is fine for a 15 degree rocker, but you don't have that. You'll have to go with a shorter pushrod to correct the geometry.
04-24-2006, 11:29 PM
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Originally Posted by heavymetals
That geometery does not look right.
A shorter pushrod isn't going to make that rocker sit better on the stem.
Your right to be concerned about riding on the edge.
A shorter pushrod isn't going to make that rocker sit better on the stem.
Your right to be concerned about riding on the edge.
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04-24-2006, 11:29 PM
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Originally Posted by LS1>girlfriend
looks like the valve is bent or the rocker is out of shape
Stock rockers look fine, these are because of the LS7 1.8 rockers, that "claim" they work on LS1s
04-24-2006, 11:33 PM
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Well...actually they are pedestal mounted with bolts holding them down.... 
But you get the jest of it...Closer to shaft style than old style adjustable stud mounted rockers...
But you get the jest of it...Closer to shaft style than old style adjustable stud mounted rockers...
04-24-2006, 11:38 PM
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Originally Posted by JakeFusion™
Point is you can still push them forward with too much lifter preload. Either the pushrod bends, the lifter collapses, or the stud mounted rocker leans forward.
I don't think so, but ok if thats what you think...a shorter push rod is not going to fix this..
04-24-2006, 11:39 PM
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Originally Posted by Ditmeion
These are BRAND NEW heads/valves ...it is like this on every valve.
Stock rockers look fine, these are because of the LS7 1.8 rockers, that "claim" they work on LS1s
Stock rockers look fine, these are because of the LS7 1.8 rockers, that "claim" they work on LS1s
they wouldnt be on my car
04-24-2006, 11:57 PM
#15
That is one way how you get the 1:8 ratio.
The rocker arm length (from the fulcrum point) on the valve side is longer then the stock one.
The other way is to shorten the length on the rocker arm pushrod side.
Problem there is how close to the pushrod hole edge do you want to get?
I wouldn't do what your doing
You want more lift?
Get a cam
The rocker arm length (from the fulcrum point) on the valve side is longer then the stock one.
The other way is to shorten the length on the rocker arm pushrod side.
Problem there is how close to the pushrod hole edge do you want to get?
I wouldn't do what your doing
You want more lift?
Get a cam
04-25-2006, 06:24 AM
#18
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For what it is worth I run these on my ZO6 with a 7.400 pushrod on Dart 225 heads. I don't recall how far mine were forward, but they were a bit forward, his look a bit extreme, I will see if I have any pictures of mine and the geometry.
There are several guys running these with I believe more than 5,000 miles on them. I have about 400 on mine breaking the motor in.
There are several guys running these with I believe more than 5,000 miles on them. I have about 400 on mine breaking the motor in.
04-25-2006, 10:58 AM
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..so from the look of my setup, should I ditch these & put my 1.7 stockers back on?... I just don't want to screw up the outsides of my valves after a few thousand miles.
04-25-2006, 12:17 PM
#20
Those rockers are from the LS7, which comes with 11* valve angles. Perhaps the 4* difference is why it looks about .125 off the tip. I guess they arent a drop in replacement like everyone claims. I too would go back to 1.7's and start planning a cam.