I am a Mopar fan but I think I scored big on some Chevy BB heads...... I went to a yard sale found a brand spankin new never been installed bare aluminum 427 head part # #3946074 and two old well used 427 iron heads part #3964291
On a Google search the aluminum head #3946074 I found this info High performance, 69-71 ,open chamber 118cc, Hi Perf. 375 L-89, 430 L-88/ZL-1 465 LS-6 and 7.
The Iron heads also come up with a Hi Performance application,
3964291 1969-70 396/402/427/ Closed 109cc 396/402/427/454 large or small spark plug, they are bare have a recently been bead blasted and probably need guides and seats and seats ground , still they are a good start for any one in need of HP heads.
Anyone want to gander what there worth? I'll trade for a coal stove or firearms