What caused this to break???
07-24-2009, 05:47 PM
#4
Teching In
Thread Starter
iTrader: (1)
Join Date: May 2004
Posts: 46
Likes: 0
Received 0 Likes
on
0 Posts
Yep went through the whole gambit of correcting for proper geometry as well as setting 1/2 turn past zero lash. They are NSA and I went with guide-plates with CC High Tech pushrods. Thankfully the pr wasn't bent, but the the valve locks did get a bit of wear, nothing too bad. I just don't know what would cause this??
07-24-2009, 05:54 PM
#5
Yep went through the whole gambit of correcting for proper geometry as well as setting 1/2 turn past zero lash. They are NSA and I went with guide-plates with CC High Tech pushrods. Thankfully the pr wasn't bent, but the the valve locks did get a bit of wear, nothing too bad. I just don't know what would cause this??
Any damage to the valve stem?
07-24-2009, 06:41 PM
#6
Teching In
Thread Starter
iTrader: (1)
Join Date: May 2004
Posts: 46
Likes: 0
Received 0 Likes
on
0 Posts
Well I'm not sure what brand the guide plates are and the pushrods do have some wear but nothing too bad, just some of the black coating wearing off. The valve stems were flat and true, no rounding or mushrooming. What is the correct ID for the guide plates if using 5/16 pushrods? I have another set of guideplates and they seem to fit a little snugger yet they are twice as thick. Could the difference in thickness be offset with preloading the lifters to 3/4 turn instead of 1/2?
07-24-2009, 06:57 PM
#7
Well I'm not sure what brand the guide plates are and the pushrods do have some wear but nothing too bad, just some of the black coating wearing off. The valve stems were flat and true, no rounding or mushrooming. What is the correct ID for the guide plates if using 5/16 pushrods? I have another set of guideplates and they seem to fit a little snugger yet they are twice as thick. Could the difference in thickness be offset with preloading the lifters to 3/4 turn instead of 1/2?
Trending Topics
07-24-2009, 09:47 PM
#10
Not off hand BUT that is not the detail I meant was wrong on most. The LT1 valve spacing is a little different than most other smallblocks. Using standard guideplates the rockers do not sit square and centered on the valve. That is why I use Isky adjustables.
07-25-2009, 10:30 AM
#11
Teching In
Thread Starter
iTrader: (1)
Join Date: May 2004
Posts: 46
Likes: 0
Received 0 Likes
on
0 Posts
I did notice that the spacing on the pushrods did seem to angle the rockers just slightly which I dismissed as normal. I think I'm going to get the adjustable plates to be on the safe side. Do you have any advice on adjusting them?
07-25-2009, 10:54 AM
#12
Damn I broke one also last week.. well, at least I found it last week and now the motor is in the spare bedroom..
I had to have my TFS guide plates machined to get the correct geometry.
My guess its it was faulty rocker like mine.
I had to have my TFS guide plates machined to get the correct geometry.
My guess its it was faulty rocker like mine.
Last edited by AChotrod; 07-25-2009 at 11:30 AM.
07-25-2009, 04:51 PM
#15
Teching In
Thread Starter
iTrader: (1)
Join Date: May 2004
Posts: 46
Likes: 0
Received 0 Likes
on
0 Posts
[QUOTE=AChotrod;11963279]
I had to have my TFS guide plates machined to get the correct geometry.
QUOTE]
Man that's a real failure right there, sorry about your luck. I ordered a replacement rocker but now I'm wondering how often these things are breaking? What exactly did the machine shop do to the guide plates?
I had to have my TFS guide plates machined to get the correct geometry.
QUOTE]
Man that's a real failure right there, sorry about your luck. I ordered a replacement rocker but now I'm wondering how often these things are breaking? What exactly did the machine shop do to the guide plates?
07-25-2009, 04:56 PM
#16
Teching In
Thread Starter
iTrader: (1)
Join Date: May 2004
Posts: 46
Likes: 0
Received 0 Likes
on
0 Posts
Does anyone know what is the correct spacing for the pushrod slot in the guide plate? I measured 2" from valve stem to valve stem but the slots in my guide plates are around 1 3/4"? I thought that the rocker arm should be square and centered over the valve?
07-26-2009, 06:29 AM
#19
Those rockers are fine with solid roller cams. I don't see spring pressure as an issue.
I also think it important to say that the pin slid sideways, the rocker came apart more than "broke". To me I think the improper guideplate causee sidelaod slowely working the pin to the side.
I also think it important to say that the pin slid sideways, the rocker came apart more than "broke". To me I think the improper guideplate causee sidelaod slowely working the pin to the side.
