The exhaust ports weren't enlarged, but the bowl
area was recontoured and the ports were fully polished.
These are 041 head castings like those that came on
'69 Camaros. They are the same basic casting as the
large valve "fuelie" heads, but they use 1.94 intake and
1.5 exhaust valves. The stock 305 head has smaller
ports and a 1.84 intake valve.