Checking pushrod length.

[rwhite65]

I am gonna check it one more time. The length difference inst bothering me as much as the way the rocker sits on the stud was. I am not hitting anything and there is clearance, but I don't like the way the rocker was sitting. Seems the pushord end of the rocker was kicked way up when I thought I was getting my best mark. I can't seem to find anything on the net about the rocker sitting up like that effecting valvetrain geometry at all.

Just gonna double check, then I will order my pushrods.

[rwhite65]

I decided to post some pics, after looking at it, it doesn't look as bad as I thought. Although I will say there is minimum clearance between the rocker and the lock nut, but if I don't hear anything from any of you gurus I am prolly gonna just order the pushrods tom.
Ryan

[Rev]

What I personally would like to know is how the rocker roller contacts the valve stem with a solid roller lifter in place? The contact area on the valve stem should be mostly in the middle of the valve stem. That's where I want mine in a "mock up" situation. Valve train geomettry is very important IMHO.

Rev

[rwhite65]

Originally Posted by Rev

What I personally would like to know is how the rocker roller contacts the valve stem with a solid roller lifter in place? The contact area on the valve stem should be mostly in the middle of the valve stem. That's where I want mine in a "mock up" situation. Valve train geomettry is very important IMHO.

Rev

In the middle, with a nice little "straight line" across the valve stem.

[andy669]

Did you check the lift with a dial indicator? If the lift is right on the money, and you have the contact patch you like, then its good to go.

Andy

[rwhite65]

Andy669-
I did not check the lift with a dial indicator, now I have to go research how to do that Can you explain that a little more possibly?
thanks,
Ryan

[andy669]

You might have to bolt a small steel plate to the head via one of the valve cover bolt holes to give the magnetic base a solid place to sit. Make sure your dial indicator has enough throw to measure the full amount of lift at the retainer. An indicator with a 1" throw is real common. Try to set it up so it is as close to straight with the valve as possible. Set it up on a flat spot on the retainer with the valve fully closed. You will have to put 5 or 6 turns of preload in the indicator so when the valve drops down you will continue reading all the way. Then when you slowly rotate the engine, just count the number of revolutions until you reach max lift.

IMO, with stud mount rockers, this is every bit as important as checking the contact patch. Because of the angle of the pushrod, the angle of the valve, and the angle of the stud, moving the rocker up and down on the stud changes the fulcrum point and can really screw with the lift.

I think its entirely possible to have a decent contact patch and still lose 30 or 40 thou in max lift. And getting that lift back might not make the contact any worse.

Let us know what you find out.

Andy