Going Price for Complete Good Used Big Block 915 Heads

holic_77 said
Are these just 915s or 67 915 HP heads? Sorry, Im new to big block and curious?
My fresh built HP 915 heads

View attachment 1716070954

It's all about exhaust valve size (1.60 vs. 1.74). Any 915 can be machined to accept the 1.74" exhaust valve. The rest of the head is the same.