Soon to be installing 1.5 alum. roller rockers on my aftermarket vortec heads. While doing a test fit(one cylinder) I noticed that the rocker's roller tips are off-center the valve stem towards the exhaust side of head. Not at the edge of stem but halfway. All through the lift range, open and closed. Did a google search and found an article where they said this wasn't always incorrect. Anyone who has experienced this and ran the set-up anyways?
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the article here http://www.circletrack.com/techartic...p_rockers.html

 

Right; not a problem. They almost NEVER are, especially with higher ratio ones.

The valves don't care if the rocker is "centered" on them. They care ALOT MORE whether the rocker is pushing them straight down, or off to the side.

Select push rods such that the contact pattern is as narow as possible. That's the sign of where in the "arc" that the rocker tip passes through, that the valve stem sits. When the contact pattern is narrowest, the rocker is "level" at mid-lift; you want the push rod length that's the closest to that you can buy on the shorter side.

Use a check spring to make it easier, use white lithium grease or gear marking compound or Dykem or even just a Sharpie, as an indicator. Don't worry about "centered", it doesn't matter.

 

Thanks for the stoppin in.. what concerns me the most is that as the rocker compresses the spring, it walks out near the edge. The contact patch stills seems narrow though. I'd just rather see it happen near the center of stem. So a shorter pushrod will bring the roller tip in towards the intake side, but the contact patch would grow? That's how I understood the article. Say if it were a clock face and arm, I would be lookin for a 2:30 - 4:00 movement, right. But presently I have a 1:30 to 3:00. Then a shorter pusrod will take it from that to a 1:00 to 2:00 position. I'll cut, radius, and fire some shorter dummy rods at work tomorrow in .1 increments and test to see what happens

 

Doesn't matter.

The clock analogy is a good one to use for visualizing it... if the valve stem goes from 12:00 to 6:00, then you want the push rod length such that at exactly MID-LIFT, the rocker is at 3:00. That corresponds to the narrowest pattern, since at 3:00 its tip is as far toward the exhaust side as it will go, and when the pattern is narrowest, the arc is evenly split in 2 halves. Where the tip lands on the stem, is irrelevant. Too many variables affect it; guide placement, how the studs are drilled & tapped, the exact rodker dimensions, etc. etc. etc.