Generation III Internal Engine - Heads & valve cover mods required for T&D or Comp shaft rockers

With the search function not working it is hard to find information. What kind of mods to the head and valve covers is required to run the T&D rockers or the Comp shaft rockers? I think the pushrod hole requires some work, but I don't know how big it has to be opened.

Also, are the Comp rockers better than when they were first introduced? There seems to been a lot of issues with them when they first came out and Comp changed the design and the supplier.

With the search function not working it is hard to find information. What kind of mods to the head and valve covers is required to run the T&D rockers or the Comp shaft rockers? I think the pushrod hole requires some work, but I don't know how big it has to be opened.

Also, are the Comp rockers better than when they were first introduced? There seems to been a lot of issues with them when they first came out and Comp changed the design and the supplier.

The pushrod holes need to be elongated towards the rockers - approximately .125 deeper. Also, check the clearence between the rocker arm and the cylinder head (at the backside, near the valve cover rail)

These are on Dart heads, not sure if the hole is already bigger than stock.

Anyone got the pushrod hole diameter on a stock head they can measure? :)

On 5.3 heads I had to enlarge the pushrod whole as the push rod will come close to the rocker pivot point and I also clearenced the rail as indicated previously. I ran a 1" space and had to knock out the baffling in my stock valve covers. Good luck!

P.S. This was for T&D 1.7 ratio.

Are you going to install them on your Darts as well?

Are you going to install them on your Darts as well?

If this question was directed to me that's a no. I have a different setup now or will hopefully have soon once I these damn lifters arrive for my motor:(

If this question was directed to me that's a no. I have a different setup now or will hopefully have soon once I these damn lifters arrive for my motor:(

It was, what are you going to run for rockers now? How come not the T&D's?

It was, what are you going to run for rockers now? How come not the T&D's?

Jesel Pro-Series for my c5-r heads. That's what came with the package I bought which originated from ESP. I personally thought the T&D's were pretty nice pieces, don't really have anything against them and would be using them still if I kept my standard ls1 15 degree type head.

I will say this though. When it comes to extreme solid roller situations it seems as though T&D is not as confident in the longevity of their aluminum rockers as Jesel is. But that is in situations where 300+ on the seat and 700+ open pressure is being used. T&D suggested their steal rockers for that purpose.

In a standard spring situation I wouldn't sweat that too much though. Good luck.

vettenuts

I thought you were running the Crane Gold series? You and I exchanged a few emails over the fall about it; what happened?

Getting ready to do heads, and examining my options. I really don't want to face that issue with the power dip at 6K RPM with the new setup. I am also looking into Crane 1.7's to see if that corrects it.

At this point, I am very suspicious that the dip is from the lifters and I will be installing Morel lifters with the new heads. :)

But while the heads are off the car, now is the time to investigate these other systems.