[CraigG.]

Hey Everybody and happy Easter!

What do you think of this pattern and length of pushrod for a mild solid roller with 263 @ .050 and .631 lift with 1.5 rockers?

Sorry sideways view.

[CraigG.]

Sorry SAME valve SIDEWAYS

[CraigG.]

Another valve

Sideways again.

[CraigG.]

The sweep is oriented towards the outside or end of the valve away from the intake.

Wondered if a pushrod .050 shorter would center the pattern better?

[4dblnkldude]

I think that looks pretty good. I was told by my machinist you want it past center like that. That's how I've done my 455 and the latest 400 I did.

[chiefbigb]

Looks decent. Some say at half lift it should be in the center of the valve

[steve25]

Would be content with that as is

[chuckies76ta]

I was told by a head guy that if the pattern is off center a bit, you want that offset to be on the intake side, not the exhaust manifold side. Hope that makes sense. There is a great video on here about push-rod pattern.
https://www.youtube.com/watch?v=o5is9BsH5OU

[PAUL K]

This is what you are looking for. If it's offset like Chuck's post describes and you're not looking to buy another set of pushrods I think you'd be fine with what you have.

[CraigG.]

The offset is toward the exhaust.

I wonder if a .050 longer or shorter would center more towards the intake side.
Also, could it narrow the Sweep?

Thanks

[65 Lamnas]

Originally Posted by CraigG.

The sweep is oriented towards the outside or end of the valve away from the intake.

Wondered if a pushrod .050 shorter would center the pattern better?

Get an adjustable pushrod from Summit. They're pretty cheap at around $20.. Then you can mess around with differing lengths and get your pattern centered and narrowed to your satisfaction

[Scott Stoneburg]

If it's offset toward the exhaust, would lash caps help bring it back to center? It looks pretty close to me.

[Formulas]

What rocker arms are involved here?
They are not all the same geometry despite being called Pontiac

I have a set of Comp ultra gold high end rockers that fit like socks on a rooster, I set them on the shelf and bought Harlan's that fit perfect, old school E'heads original valves

I put those Comps on a #13 iron head with a RA-IV valves = much better fit with the valve tip closer to the stud

[CraigG.]

1.5 Harland Sharps e head

[chiefbigb]

The pattern should start on the intake side

[tooski]

I used the Straub 1/2 lift method. It resulted in almost a 3/8 inch longer pushrod. It narrowed the trace considerably, but also moved the trace considerably towards the exhaust.

[blueghoast]

Originally Posted by PAUL K

This is what you are looking for. If it's offset like Chuck's post describes and you're not looking to buy another set of pushrods I think you'd be fine with what you have.

I second this. I've run mine that way with no problems.

GT