What is the maximum amount of head milling anyone here has done successfully? Seems .100" is common, but I've heard of .140" and beyond. What have you done?
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FERRARI MYTHOS HISTORY

I believe people have done as much as 0.200", but 0.100-0.150" is more common.

Lou

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Home of Slant6-powered fun machines since 1988

To set-up a quench area in a 225 SL6 your best bet is to get an early (60-67) head and angle mill it, taking most of the material off the manifold (port) side.
Doing that will give you a flat area to work with.
DD

Doc, yes, that's exactly what I'm looking to do. The head in the pic, can you tell me what angle was used and how much cut?

Thanks!
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THAI COOKING

I have done up to 0.210" on the plug side and 0.110" on the manifold side on an early head. No problems even with multiple head swaps. That giave me 33 cc semi-closed chamber with SB Chev valves.

Lou

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Home of Slant6-powered fun machines since 1988

Did you mean .210 on the manifold side and .110 on the plug side? Seems to me you'd want the semi closed chamber on the side away from the plug (to force the mixture toward the plug).
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Ship Sale

I meant what I said. Doc's suggestion may work better. I have run up to 11:1 comfortably on pump premium with that head and a big cam (250 @ 0.050").

I might worry about deck thickness when doing 0.200"+ on the intake side. On the plug side, you mostly have the pushrod opening and no water jacket for 2" in from the edge.

Keep in mind that many combinations make power and work with pump gas, but aren't necessarily "the best." I always like to have my car running, so I do not tend to plan everything to the last detail. I have seen a lot of people paralyzed with a car that never runs because they can't decide what is "the best." My advice is to make a decision and just do it.

I am not saying you are going to do this, just a warning/philosophy.

Lou

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Home of Slant6-powered fun machines since 1988

When you angle mill the head, do you angle mill the stud holes on the other side?

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Understandable, though I do tend to plan to the last detail, which is why I seem to ask so many questions. I've always ended up with better builds that way. This being my first 'serious' slant build, I'm tossed up here deciding between a naturally asperated 'quench' built engine, or staying stock and going with a turbo. Both have their merits which makes the decision difficult, so I'm researching everything I can about both approaches. Thanks all for the advice. It actually is appreciated!
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