Need some info on what this manifold is from?

Cruze426 said
Seeing this, I would have to agree with you. So, I don't remember my '69 340 intake having larger secondaries, did it? Or has the pictured manifold had its secondaries altered ? I ran a 440 AVS on my 340 with the stock intake manifold, the 440 secondaries are larger, but if you opened the throttle , it would just align itself. Oh well, just saying.
Thanks

RustyRatRod said
I don't know what you had without a picture, but the manifold in question above is a factory unmodified piece. "I THINK" the 68 340 had symmetrical venturi and the 69 and 70 had the larger secondaries, then the 71-73 had the TQ. I do know "there was" a 340 intake where all the holes in the pad were the same, I am just not sure which one it was.

Mattax said
This guy has a pretty good list intake numbers, applications, and photos.
Scroll to the middle of the page for factory intakes
Mopar Smallblock Intakes

Heck, look at the 273 manifold. Even it had smaller primaries and larger secondaries.