Exhaust port size 340 J head

[72 Challenger]

Hello Engine Guru's

Really simple question. I have a 340 Engine in my car with J heads. What is the exhaust port size? I am trying to buy gaskets to put my engine back in but my work is keeping me away from my garage. I need to order the parts so they can be ready to pick up when I return. Some sites list the same numbers for 318-360 motors while others exclude the 340. I know that they are different in size but I am guessing that they just create one part size for all?

Any ideas?

1.75x 1.5? 1.6?

[Chryco Psycho]

You need gaskets specifically for the 340/360 , the 318 is smaller

[72 Challenger]

Thanks Chryco,

That explanation works too!