got my car back togeather after my comp R's grenaded kept in the comp guide plates as my isky's havent showed up and they work perfect! just so you guys know. i define working fine as there is no rubbing and plenty of clearance throught the whole pushrod stroke.

 

thats not the problem...the tip is not centered on the valve tip...they will either jump off and break/bend PR or wear the guides out

 

run them for a few more miles and track passes, youll probably change your mind about them.

 

No, they are not fine.

 

Valvetrain carnage in your future.

 

remove the valve cover and look over the fender and see how the rocker sits on the valve tip. It NEEDS TO BE sitting in the center of the valve and the Comps (or any other guide plate made for a standard SB Chevy) will have the pushrods sitting off to the side a lil. This will put lots of stress on the valve and valve guide resulting in prematurely worn guides.

The isky adjustables are the best choice if you take the time to get everything centered. The best "non adjustable" guide plate to just bolt down is the Trick Flow 30400623-8 guide plates.

Here is how to get the right PR length while you are at it. . . . .

http://ls1tech.com/forums/showthread.php?t=327734

post # 5 explains it all very well. Just use a real week valve spring from hardware store in place of your valve spring. This allows you to reuse your stock hyd roller lifter with out compressing the plunger in the lifter as this would throw off the pushrod measurement.

Lloyd

 

Get the Manley 42355-8 guide plates. I have them and they fit perfectly.
Chad at Golen uses them too.

 

not trying to steal the thread, but my machine shop is using EngineTech guideplates on my heads am I asking for trouble with these?

 

never heard of them personally, but it might be a good idea to go with one of the well known companies listed in this thread that are known to work in a LT1

 

Brand does not matter looking and making sure things line up matters. The LT1 spacing is not quite the same as what most plates are made for. I used the GMPP plates for a year and while they lined up better than Comp they were still not great, I suspect the TricFlows are the same way. That is why I went to Isky adjustables.

After 8K or something like that the GMPP did have some wear too them.

 

dang, one more issue to worry about before i order my parts

 

I can second that. After seeing those yesterday we could only pick out some that looked better than others but all were worn pretty good!

 

I should have dug out the Comps to show the different spacing. I just compared them and if you lineup one slot the other slot is by eyeball nearly 1/16" off, the GMPP ones are closer but still not quite right, meaning the Comps are way off.

 

My old pics. 200 miles regular driving no WOT

Comp Cam for small block chevy after 200 miles


Pushrod after 200 miles


GM LT1 plate on top and the small block chevy plate in the back with wear