Tbi rockers and push rod questions

[Bburban94]

I bought some used heads but they didn't come with rocker arms or push rods i was wondering if I could swap my rockers and rods off my old tbi heads to my bare head what would be the process

 

[PlayingWithTBI]

Are the new heads the same as the old ones? If so, then probably yes. I'd want to use a length checker rod to ensure the rockers are centered on the valve stems. Something like this.

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[Nick_R_23]

Normally yes, but the style of rockers you have must match the heads.

Chevy heads and rockers mostly came in two styles - self-aligning and non-self-aligning. To identify the heads, look at the size of the hole that the pushrod travels through. You MUST use the correct rocker arm style with the head style.

If it’s a large, open hole that the pushrod has plenty of room to move around, you need SELF-ALIGNING rocker arms. These rocker arms will have a stamped indent at the tip of the rocker arm that will “cradle” the tip of the valve stem, keeping it aligned on the valve.

If the hole is barely wide enough to fit the pushrod through (slightly slotted for up and down movement), you need NON SELF-ALIGNING rocker arms. The slot in the head keeps the pushrod guided, eliminating the need for the rocker to do the work. These rocker arms will have a large, smooth, polished surface with no stamping.

 

[Bburban94]

The heads I bought are cast 193 tbi heads

 

[PlayingWithTBI]

The heads I bought are cast 193 tbi heads

And the old heads are 193 too? As long as you kept the lifters in the same holes they were in, install the push rods, rockers, and set lifter preload. You can find a procedure online. Everyone has their own way to do it.

 

[Schurkey]

The complicating factor here, is that "used" rocker arms are usually junk.

They're often worn-out at the valve tip. Sometimes worn out at the pivot, or at the pushrod tip.

When I tried to "get by" with re-using Oldsmobile rocker arms and pivot stands, I needed three sets of rockers to make one "adequate" set.

 

[Bburban94]

These are my old heads that I pulled off my old motor they are clearly stamped 193

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[Bburban94]

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These are the heads I bought are these the non self aligning heads if so can I still use them they are also stamped 193

 

[Nick_R_23]

Yes, the heads you bought require the non self-aligning rockers. You can use them with no issues as long as you use the proper rocker style with them.

 

[tayto]

All the TBI heads came like that, I have seen both self-aligning and non-self aligning FWIW.