1958 Dodge

matthon said
So the issue is which 4 barrel manifold fits a 58 325 poly?
Obviously, a 58 poly 4 barrel, but which hemi?
My understanding is there is a standard block, 331 & 354, and a raised block, 392, and I've heard other terms, early hemi, baby hemi, and lower displacements as well.

Dodge poly needs a Dodge intake; Chrysler won't fit. Something I'm not sure of is whether you can put a Dodge Hemi intake on a Dodge poly.

Don't know the numbers, but a tape measure comparison of the length of the intake should suffice to let you know if it is a Dodge intake. Dodge hemi/poly motors are noticeably shorter than either DeSoto or Chrysler. Then measure width and compare it to the width of your two barrel intake for whether it's a raised deck or not. Early Dodge hemis were short stroke, low deck. 56 and later 315 and 325 motors were long stroke (3.80 inches) with a raised deck. Low deck and raised deck Dodge intakes are different, as I found out a while back when I was trying to sell a tri-carb Dodge intake on ebay.

Other than the 277 poly in my 56 Plymouth, I've not played with any of the early hemi/poly motors myself, but when I was a kid, my Dad owned a 56 D500 with a 315 hemi. Kept blowing head gaskets, so a couple of years after he bought the car in the spring of 57, he replaced the 315 hemi with a 57 325 inch Dodge poly motor which had the same rated hp. Said he could not tell any difference in performance. I was too young to know if he was right.