Quote:
Originally posted by ERA Chas
Do Ersons work on Shelby heads without modification?
Thanks,
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Yes, but since the Shelby heads are 427 MR style heads (with wider valve spacing) you will have to move some of the shims to align the rockers with the valve tips. Erson rockers will not work on HR heads.
Erson also has a part number especially for Edelbrock heads where the shims are already positioned correctly for Edelbrock heads. However, the valve spacing on Edelbrock heads is not the same as 427/Shelby heads so you would still have to move some shims.
When ordering Erson rocker arms, keep in mind that the two part numbers are the same except the placement of the shims. So if Erson is backordered on one part number, you can still buy the other part number and just move the shims yourself.
Very early Erson FE rockers had uncaged needle bearings that were a pain when you removed the rockers to move the shims around because the needles would fall out. But Erson FE rockers made in the last 3 or 4 years have caged needle bearings.