redwingvette

Heads are on, liftersin, push rods, and roller rockers are on. Not all of the rockers are centered over the valve. Intake and exhuast valve for the same alignment plate are close but not perfect. Is this normal? Do I not worry about it as long as I split the difference.

gkull

If your talking about front of the motor to rear of the motor off center.

Your need to loosen the screw in studs and then you have a certian amount of pushrod guide movement. You have to get the rockers to center the best without rubbing into the pushrods. On some motors I had to grind out the guide plates for pushrod clearance.

If your talking about not being centered. Intake to exhaust. That's corrected by pushrod length changes.

VBP

I had Comp Cams guide plates and Erson Roller rockers and the rollers wouldn't line up to my specs. I bought the Erson guide-plates and it fixed the misalignmment problem. Use the same guide-plate manufacturer as the roller rockers. :yesnod:

redwingvette

Roller rockers are Crane Blazers and the guides came with the Performer heads. The mismatch is between the intake and exhaust for 2 or 3 of the cylinders. I loosened up the plates and split the difference between them. The push rod gets close to the clearance in the head but doesn’t touch anywhere so I think it is as good as there going to get without altering the guide plates. Is this acceptable All of the valve stems are lined up with the roller; just not directly on center.

gkull

I wouldn't worry about it if the stem is on the roller :cheers:

cardo0

Hello redwing,
Roller tip alignment was a big headache for me. When changing heads and/or gaskets the pushrod length needs to be corrected such that the roller tip strokes from the top 1/3 of valve stem to bottom 1/3 of valve stem and back again to prevent side loading of valve guide - especialy on a street motor. The hardest and most accurate method is using an adjustable push rod. I tried many times and gave up. Finally bought a Moroso plastic checker for $20 and measured my stock pushrods where 50 thou. too long. Tool is very easy to use . Also tried the same tool made by ProForm and measured 60 thou. long pushrods. Bought some 50 thou. shorter trickflow pushrods ($90 @ Summit) but they only measured 33 thou. short. Hopefully the coating (black stuff) on pushrod will wear off and the rods will be correct length in use so there can be a happy ending to this story. The vavles are now adjusted and rocker tips look just fine now using my calibrated eyesight.
Good luck,
cardo0 :p:


[Modified by cardo0, 5:13 AM 12/18/2002]

BSeery

:lurk: -- as I may have to do this soon....

redwingvette

Good info as usual for this site. I hadn't checked the alignment from front to back yet. I was just lookig at it from side to side.
Thanks