340 J heads fs/ft 2.02 valve

J heads are mostley known for the 1st run [915] but actually were cast under diff #'s though out the 70's, and had a few minor differences.

this set '2nd generation' has the smog bosses but aren't drilled which could be a plus since these things can leak right below the header after a gasket match, typically there is not much flange width left there.

there are some 974 cast j's too.

sometimes when I look at the later 70's j heads they look different in the short turn, 'shorter'.

only cutting them in half and comparring, or talking to the engineer who designed them would say for sure.
but it's the early ones that people want, so...