920sLooking for 67/68 273 closed chamber heads, not sure of the casting numbers.
for 67. 68 would be casting number 675, open chamber.920s
Ohh okay got so how much ifyou have those.I have both 915 J heads and 587 Heads with 1.88/1.60
valves.
I recommend the 915 J heads because the 587 I run across
often are cracked between intake and exhaust valve seats or
Exhaust valve to spart plug hole. They generally do not ever leak
but the cracks make me nervous especially if I am putting a lot of
time and money in them.