I was wondering how much can i mill my stock head with stock valves?

This can be a complicated issue. What are your goals for the car and what type of fuel, cam, induction do you want to run?

Physically, you can mill the head about 0.140" or more, which would give you something like 10.5:1 comp on a stock block.

Lou

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Home of Slant6-powered fun machines since 1988

Two barrel carb 800 to 4800 rpm comp cam port and polish 3 angle valve job.

Educated guesses:

For 87 octane, mill it 0.060".
For high octane pump gas, mill it 0.100-0.120"

The bigger mill may require custom pushrods.

Lou

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Home of Slant6-powered fun machines since 1988

I will have it milled to .050 just to be on the safe side. Thanks for the info.

I would go for the .060, you will lose about .015 due to the thicker aftermarket head gasket

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

The cylinder head on my s/6 has been milled down so there is no edge,(on the shallow side) and the "thumb print is gone" It ran ok on 95RON PULP.
Had a modified dizzy, and it pulled like hell. Would do 120MPH and sit on it for 20mins or so. If you got a decent cam, you'll need the compression to make it work for you.