Originally Posted By BSB67
Number one I believe is a pre 67 intake and has the smaller carb bolt pattern. It might be a little shorter, and the runners maybe smaller too.


He just picked that as an example I think , 68/69 383 and 440 intakes have a 4 hole pattern like that. I think there is even a version of the 70 383 intake that is 4 hole also, I think I have one .