Rocker arm roller obliterated on new head

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06-02-2020, 12:03 PM

#26

Julien Scherer

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Quote:

Originally Posted by steelmesh

Was it a brand new OEM head untouched?

Yes, from a crate engine with 0 miles on it

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06-02-2020, 03:51 PM

#27

5-Speed

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Quote:

Originally Posted by jdbaugh1

What trade-off would you have from making that hole a little larger? Would that help with higher rpms and valve spring pressure?

The older Ecotecs dont have the restrictor. I believe GM did it to the VVT models since they have a different oil pump that flows more volume. Having the restrictor also helps keep less oil sitting on top of the head. The lifters only need something like 15 psi to operate fine. With the restictor in there I believe it limits the head to 25 psi.