1978 318 heads? Small port? Or large

I know. But I have a TON of experience tearing engines down and that era is where I have the most experience. I have torn down I KNOW in excess of 1500 engines.

Never ONE TIME have I torn down a 318 that was a factory four barrel that had the big port heads. Not ONE.

Of course, that's just one little peon in Georgia. But I have never seen another one, read of another one or known anybody else that had big port heads on a 318 from the factory. So my experience is all I have to go on.

I KNOW this much. Chrysler most certainly DID put the 360 4 barrel intake and carburetor on the 318 engines with small port heads......which begs the question, if they did that, (and they DID) why in the world would they have done it both ways?