Reply to "4V CC head porting with pressed bronze valve guides."

panteradougMember

Use the head gasket to mark the edge of where you will grind out additional chamber material.

Grind the chamber out to that scribe line. The exhaust side also.

This shows in the Ford diagram. It will add cc's to the chamber volume but the only thing important is that you match the cc's in each cylinder.

That procedure would be pretty much standard for race prep or even "blueprinting".

To be scientific about it you need to flow the heads at .100" lift intervals before and after you enlarge the chamber.

Both my iron 4v heads and my aluminum A3 heads are opened up to the edge of the head gasket, yes. It does help.

9/15/153:37 PM

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