Bought and installed Scorpion nsa roller rockers, hardened push rods and guide plates. Installed the T F guide plates with hardened P R and set them up so the R R were centered on the valve. Seemed all good when I rotated the engine several times by hand. Started the engine up and ran a few minutes and let warm up. Noticed rockers seem to be tickking a little. Pulled the v covers to recheck rockers and noticed marks in the P R. Some have small wear marks and some have major scrapes. Pulled the R R off and removed a guide plate that was rubbing the worst. Looked where the marks were on the guide plate and there was none on the sides, but there was down in the middle at the bottom of the slotted part. Did I not install them right ? Can I file some of that area away and make more room or will that effect the hardness of the plates?

 

Few people have this issue. When I switched to 1.7's mine were close also. All I did was use a die grinder and made the slot about .060 deeper. Use caution, do not touch the sides.

 

You also need to make sure that when you install the plates that you install them centered on the rocker stud before tightening them down.

 

Thanks for the replies. Grinding them will not effect the hardness and weaken them?

 

They are probably surfaced hardened, so any grinding is going to remove that.

 

The area in question is at the bottom of the u, that's why I said "use caution, do not touch the sides". The sides guide the pushrod.

 

Will the hardness only be effected were I file or will that effect the whole plate?

Is this problem a normal problem that you have to adjust for or is this something I did wrong?

Don't know what I should do?

 

There is a little room for adjustment with the TrickFlow guideplates. Loosen the rocker studs, center the guideplates, and push them down toward the exhaust side of the head while tightening. See if this helps.

 

Get the gm ones and you shouldn't have a problem

 

He shouldn't have any problems with the ones he has. If he is actually using 1.7 rockers (a fact that I don't see established), it is not unusual to have to deepen the slots in any guideplate (unless you are saying that you know the GM plates have deeper slots than the Trickflows).

 

Thats just it im not using 1.7 im using 1.6 ratio.

I used an adj P R and centered the mark on the valve stem and ended up with an 6.886 length P R. seemed really short but with the standard 7.2 P R it was way out on the exh side.

Could this cause the scraping because the P R are so short?

I know there is another way but it seems complicated. Plus the local mach. shop said they do the marker, center the mark on the valve stem way and that it works fine.

 

I have never heard of a pushord needing to be that short. That is likely causing the issue. I assume you did the measuring correctly. Have the heads been extensively reworked? Surface milling and valve length could be factors.

 

I had the heads redone, they milled them .005 but the previous owner replaced the head gsk before but don't know how much they were machined. The valves were reground also when they were at the machine shop.

 

Whats the difference in setting the GM's up? Thats what I have and need to adjust.

 

What do you mean? There is nothing you have to do different from one brand of guideplate to another.