TF 190 Heads

j par said

Since we're kind of waiting for more data to come in on these heads I had a semi related question? Very related to Geometry.
Have you ever ran into a situation where you didn't need to shim the shafts off their pedestals?

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With a roller rocker, believe it or not, no. The stand position is copied from the factory on most aftermarket cylinder heads, which is engineered for a stock rocker, stock valve, stock cam, etc. The roller rockers have different geometry, and need to be moved.

There is one exception. I had a guy put shorter valves in a TF 190 head because he needed a super duty valve for twin turbos and couldn't get the same length TF uses. He was within .010" of correct, so we left it alone. I have never had an ootb head that didn't need adjustment using a roller rocker.