Open chamber not the cause of detination

I like you had the idea that the reason the 400 engine was detinating was the style of the cumbustion chamber. i slaped a set of closed chamber heads on the 400 and got the same results. After a close look at the 400 engine We found the pistons stop more than .070" from the top of the bore with a.040 head gasket this leaves more than .110" squish clearance With this much clearance there is mothing to force the charge to the center of the cumbustion chamber this is what is causing detination,not the shape of the heads.