I had a 14,000lb E350 box truck, high cube. It had a 351W 4V and back when I was building 5.0's, I stole the 351 4V heads off the E350, put them on the 5.0, and drilled the headbolt holes out of the 5.0 heads (1.74/1.5) and put them on the 351. Then, I put a 2... Login to read more.