Had the same issue on my 588, with same heads, intakes rockers also.Sent rockers back to Jessel, talked to Joe in rebuilders shop. There are 2 bearings inside of the intake rocker versus one on the exhaust. They can move the bearings around inside of the rocker body to position the rocker correctly. BTW there are spacers there and I did use them to fine tune the positioning of the tip. I race my motor and have been checking them weekly for any wear, so far so good. Jim

On his it does look like the shaft can turn end to
end.. on my TDs they cant.. but his bolt spacing is
equal.. your right that the others dont have a spacer

In the second pic he posted, I bet if he moved that spacer over to the other side of the rocker, his tip positioning would be pretty close. Jim.

Oh, pretty sure those shafts cant be turned end for end cause the middle bolt goes in at an angle compared to the outers. Jim.

Those intake rockers are located by the needle bearings against the snap rings. If they are off center, the bearings are out of place and need to be moved. You may need to buy new bearings to fix this. They are needle roller bearings, .750 outside diameter, 9/16 or .563 inside diameter, and .500 (1/2 inch) wide. About $5 each. You can make up the tools to press them in and out by shortening a 9/16 bolt to about 2 inch of smooth shaft, and a piece of steel tubing, 3/4 od that will slide over the bolt , sanded down to go through the .750 rocker body, about 1 1/2 inches long, just longer than the rocker body is wide. Take measurements of the depth the bearings are on rockers that fit, then push out the bearings on the offending rockers and carefully press new ones back in where they need to be. You now have the tools and know how to fix a hurt rocker, but the shafts are usually toast if a bearing lets go. I have spare shafts and bearings for repairs. The exhaust rocker bearings are 3/4 wide, otherwise same dimensions. These offset Jesel intakes have been a huge pain in the butt for me, lots of bearing failures, as you read about. I am currently running bronze washers that run between the intake rocker bodies and the rocker bar. All the intake rocker snap rings and spacers are not used. To get the right thickness I had to order washers that were 7/8 diameter by .062 thick, then open up the center to 9/16 with a die grinder. You can't drill them, at least I couldn't.

Greg, where do you get the bronze washers from? Do they stand up well with the side load? It would be nice to not have to look at the rockers after each day of racing. Jim

I can't remember for sure, but any industrial supply house ought to list washers on their web site. I only have about 25 or 30 passes on the washer deal, but they look like they are going to hold up.