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Do your math and you will see that you gained .010 didn't loose it. Using a shim will actually make things worse.
You milled .030 and used a .040 gasket. Therefore you increased the distance not decreased. By milling .030 and using a .040 you actually lost ground.
Put it together and forget the shims they will make things worse.



I'm doing the math trust me!

I cut the head .030 = .030" LESS distance
I increased the head gasket from .020"ish to .040"ish = .020 MORE distance

.030 less distance from the cut and .020" more distance from the DIFFERENCE in head gasket thickness makes a total of .010" LESS DISTANCE. Not more.
My heads are .010" closer to the cam centerline than before.

I think you forgot to factor in the original .020"ish steel shim factory head gasket in your equation.... that was REPLACED by a .040" Felpro...

Ether way,your good to go without shims. BTW, why would you want to cut the heads .030 and then add .020 back with a thicker head gasket???

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