This is the casting number I see on the heads. They are 60919 heads that were bought as bare heads, milled down for smaller chambers and have nice set of valves and some cleanup and blending work done to them.
I was asking you about porting gains in summer time having these heads in mind actually.
There are lots of things to consider, valve to piston clearance changes for one, and what is the quench/squish distance now? By the sounds of it, You've got 10:1 flat-tops,
& they milled enough to compensate for the Fel-Pro head gaskets. That means no squish whatsoever, a closed chamber head could cause more trouble with the piston down
in the block that far, what type of Eddy chambers and how much was cut? If detonation doesn't rear it's ugly head, and the rockers/valvetrain is sorted out, You should see
a nice pick-up in grunt.
