valvetrain geometry so bad, nuts were scratching rockers
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Joined: Oct 2002
Posts: 420
From: Warrenton, VA
valvetrain geometry so bad, nuts were scratching rockers
I bought a supercharged 96 SS a few weeks ago. I thought he probably didn't have the rockers set right so I went in there and noticed scratches on all the 1.5 Crane rockers from hitting the retaining nuts. I haven't turned the crank yet, but not a single rocker axis is close to perpendicular to the valve axis, they're all lower on the pushrod side, on every valve, at the same time. The pushrods are too short, way too short. The wear spot on the Ferrea valves are all on the stud side of course. (They're AFR 190 heads.) Hopefully not too much life was taken out of the valves.
The pushrods measure 7.05" as close as I can tell with a ruler. So I need an adjustable pushrod and a marker right. The LS1 guide http://ls1tech.com/forums/showthread.php?t=327734 says "The first step is to install a solid lifter and an adjustable pushrod. Mark the tip of the valve with a marker"
I assume when he says solid lifter he just means a hydraulic lifter, not some kind of adjustable lifter?
The pushrods measure 7.05" as close as I can tell with a ruler. So I need an adjustable pushrod and a marker right. The LS1 guide http://ls1tech.com/forums/showthread.php?t=327734 says "The first step is to install a solid lifter and an adjustable pushrod. Mark the tip of the valve with a marker"
I assume when he says solid lifter he just means a hydraulic lifter, not some kind of adjustable lifter?
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Joined: May 2006
Posts: 142
From: Patchogue, NY
If you have a spare lifter, take it apart and make it a solid lifter for testing purposes. Remove the clip, the cup and the spring inside. Replace the spring with washers to make it solid and reassemble. Then use an adjustable pushrod and the marker to see what size pushrods you need.
Thread Starter
Registered User
Joined: Oct 2002
Posts: 420
From: Warrenton, VA
Crap, you actually have to use a solid lifter? I don't have a spare and I'm not sure I would want to crack open one of the ones I have. I just made a trip to get an adjustable pushrod today and thought I had what I needed. This simple job has turned into another PITA.
Thread Starter
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Joined: Oct 2002
Posts: 420
From: Warrenton, VA
I just found this
SStrokerAce
Registered User
Re: pushrod diameter
Yes, get at least the PR that Silvershark showed you. I use them or Comp Hi-Tech at the minimum. A lot of the times the Hi Techs are the only ones that will come in the length you need.
You can use the hyd lifter to check, it's not as accurate but it's usually very close to what you would be running anyways.
Bret
Registered User
Re: pushrod diameter
Yes, get at least the PR that Silvershark showed you. I use them or Comp Hi-Tech at the minimum. A lot of the times the Hi Techs are the only ones that will come in the length you need.
You can use the hyd lifter to check, it's not as accurate but it's usually very close to what you would be running anyways.
Bret
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Joined: Oct 2002
Posts: 6,518
LOL, yep I was quoted in saying that.
I have a few different old hyd lifters converted over to solid lifters in the shop for checking PR length and suprisingly if you do the checking correctly you can still get extremely close with the hyd lifter you end up running.
IF you make a solid checking lifter, you have to make sure your distance from the PR cup in the lifter to the tip of the foot of the roller wheel is exactly right. If you are off more than .020" then you can easily get the wrong PR lengths.
Bret
I have a few different old hyd lifters converted over to solid lifters in the shop for checking PR length and suprisingly if you do the checking correctly you can still get extremely close with the hyd lifter you end up running.
IF you make a solid checking lifter, you have to make sure your distance from the PR cup in the lifter to the tip of the foot of the roller wheel is exactly right. If you are off more than .020" then you can easily get the wrong PR lengths.
Bret
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