The Ford Barn - View Single Post - Compression Problem Revisited - Update

James Rogers · 03-12-2012, 08:28 AM

I have seen heads that have been milled as much as .125 and still work. The counterbore is .125 +/-. I have racing heads with no counterbore ie: flat with combustion chamber at 8-1 CR. You shouldn't have to mill more than .010 or so to get the head flat.

I do compression tests with the plugs out and the throttle propped open to maximize air intake.

Personally, I don't like the "new and improved" head gasket. I always use copper unless the customer furnishes something else.

03-12-2012, 08:28 AM	#32
James Rogers Senior Member Join Date: May 2010 Location: Asheville,NC Posts: 3,104	Re: Compression Problem Revisited - Update - See p2 I have seen heads that have been milled as much as .125 and still work. The counterbore is .125 +/-. I have racing heads with no counterbore ie: flat with combustion chamber at 8-1 CR. You shouldn't have to mill more than .010 or so to get the head flat. I do compression tests with the plugs out and the throttle propped open to maximize air intake. Personally, I don't like the "new and improved" head gasket. I always use copper unless the customer furnishes something else.