Dont...

Was doing a head/cam swap for a buddy today, and he bought a set of lloyd ported heads used, and they came with CC guidplates on them that the previous owner used. Well they definitely dont line up on LT1 heads. I was skeptical when Lloyd told me (when i had mine done) that GM LT1 guidplates are the only ones that work, but it is true, one side of the CC GP's is like .125" off of where it needs to be.

Dont ask me how the previous owner got away with it, or maybe he didnt, possibly why he sold, but I just wanted to see what others had to say about this.

 

I ran them on mine and had no throuble with them.

 

what is the pn stapmed on the plates?
I have a set that is going on my car now just waiting for my rockers, they are pn 4800 and are the stepped design.

 

Well, they might work fine, but they are not right...I tried them and the valve tips edge was off the roller, and it would not make it onto it no matter how much I adjusted it, so even if they do work, which they will, its probably wearing into the valve tip...except that each head im sure is different so others could maybe not have this problem.

Must be some reason Lloyd Elliot says you cant use them though!

 

what is the part number?

 

Oh, sorry, dont know off hand...But comp cams does not make a GP that will work for LT1, all they offer is standard SBC...I dont myself understand the difference, LT1s must have slightly, very slightly different valve spacing than SBC.

 

Either GM 14011051 or Isky Adjustables or you are going to break a PR or wear out the valve guides, one or the other. Take your pick both cost coin to fix the damage.

Bret

 

Thanks Bret...
Hey, do you know what the GMs are made of? A machineshop was doing a friends engine, and we took them the GM GPs and they said you cannot use them with hardened pushrods because they are soft steel or something, and will wear the GPs down.

I didnt really listen to what they were saying knowing that you CAN use the GMs or they wouldnt make them, Im just curious what the composition is, they look pretty weird, maybe Pops (oldstroker) can chime in here.

 

lol, YOU HAVE TO MAKE GUIDEPLATES THAT ARE HARDENED!!!!! I THINK GM KNOWS THAT!

Sounds like morons trying to sell you guideplates.

BTW the only way you can tell if a guideplate is soft is to basically destroy them and do a test on them.... at the least you can do a Rockwell test to see if they are hard enough on the outside.

It blows my mind how dumb people really are.

Bret

 

combination motorsports also sells guideplates for the lt1, ended up being a bit cheaper than the gm ones, i believe my local dealer wanted $5/guideplate.

 

The GM 14011051 guide plates are safe with hardened pushrods. the guyie plates are hardened or at least are hard enough to be used. They are not dark like most "hardened" materials but i have used them many times with no problem.

They align the rockers and valve tips alot better and the other guide plates will still "work" but the roller tip doesn't sit centered on the valves.

You have to buy guide plates anyway so you might as well send the $20-$25 on the right ones. Since you already have the Comp guide plates, you can use them if you like but the guides will see alot more abuse since the rocker is not pushing strait down on the valve. A worn guide will rob power and destroy a valve job pretty quickly.

Make sure and use sealant on the intake studs when installing the new guide plates.

Lloyd Elliott
972-617-5671
Eportworks.com

 

I think it's crazy that people would knowingly put on the wrong guideplates just because they are available to them, or came with a cam kit, or for whatever reason.

USE THE GM GUIDEPLATES! They are cheap, there is NO reason to use anything else, unless it's an adjustable guideplate like mentioned earlier.

When your valves are being opened and closed 100 times per second, you want to have everything lined up. Small errors make BIG problems at high RPM's.

Dan

 

Well I have the Comp 4800's bolted on right now but I haven't ran them. I thought they looked weird, I put a rocker on and am having the same problem. The Part numbers Lloyd gave are for the gm aluminum bowtie head which is based off of the lt1 head(makes sense) also gm makes a set that are NON-HARDENED PN 10111711 for a corvette aluminum head which has been discontinued. I called and ordered a set from combination motorsports and they were $15 for the set plus shipping. Hopefully this is usefull to some one.

 

What sealant would you reccomend using?

 

I use liquid PST (Pipe Sealant with Teflon) since gas will not deteriorate it like silicon.

Lloyd