I bought a kit from a fellow board member, had Comp Pro Mags, Comp Guide Plates (#4808), studs and poly locks.

Can I use these guide plates on my LT1?

-James

The previous owner had them on a LT1.

 

I think you already answered your own question but I came across a few postings that stated the only way to go was with the OEM 14011051 guides.
Look into the postings for Scorpion Roller Rockers... thats where I saw that info..


Marvin

 

GMPP are the ONLY plates that will work on an LT1 without modification. The LT1 has .050" wider valve spacing than a typical SBC, so regular SBC plates WILL NOT WORK. COMP doesn't even make a plate to work on an LT1. If you try using the COMP plates. look closely at how far your rocker tips are off center on the valve tips.

Frank

 

What Frank said

I've got a set of comp guidplate that are now making a very nice set of matched paper weights thanks to that fact. After installing them and checking things, I found that they are indeed about 50 thou' off. The GM guidplates are the ONLY way to fly if you car at all about your geometry.

Dave C.

 

ok , I have a newbie question , what is a guideplate and what does it do. Ive never encountered them on my car that I know of and Ive dug around a bit on it. Its never come up in conversation so Im just curious.......... lol and "I" wanna play with nitrous lol

 

BigJustinZ28- There are two different types of rocker arms available for our cars (or any other engine for that matter). Self-aligning and non-self-aligning. The self aligning rockers have either two small "washers" or alignent tabs on either side of the roller that rides on the valve tip. This keeps them centered on the valve tip left and right. The stock stamped steel rockers have the same function build in, but accomplish it by means of a slot stamped into the rocker at the valve end to locate the valve tip.

NON self-aligning roller rockers have no "self centering" or aligning feature, and need guideplates to hold the pushrods in the correct position to keep the rocker tip centered over the valve left and right.

The non-self-aligning rockers are the reason for this thread as well as the importance of getting the right guideplages to use with them. If the rocker arm is not centered on the valve tip left and right, then it places undue thrust thress on the valve, loading the valve tip awkwardly, and wearing the rocker tip, the valve tip, and the valve guide, or all three.

IMHO, there's no right or wrong when it comes to the rocker issue of self-aligning versus non-self-aligning. The only real drawback to the self-aligning type is the fact that if you float the valves at higher RPM's, you stand a real chance of having the rocker tip "slip off" the valve tip and press down on the retainer side which can easily break it or the break the valve or the rocker. Very bad thing. I personally prefer to use non-self-aligning rockers with the proper guideplates. I'm assured that I wont have troubles with it. They DO require that you use hardened pushrods though, as the up-down motion on the pushrods where they pass through the guideplates would wear down and eventually wear OUT a non case hardened pushrod.

Hope that answers your question.

Dave C.

 

actually that was very informative and explains why I havent come across them before , all my car would be of the self aligning variety ). Thanks for taking the time to explain to me .

 

NP I did forget to mention that there's another rocker option (like the LS1's use). A shaft mounted rocker. Accomplishes the same thing..

Dave C.

 

I am running summit brand raised guide plates and they work just fine, not to mention they are like $17. Although, just to make sure I am going to pull the valve covers off and take a real close look at them, though I really dont remember them looking off.