Thats exactly what I thought.

 

351 clevands had major heads differences, not block bore/stroke. Similar to a Boss 302, Ford was looking for more performance from a base engine.

 

A Ford truck motor will almost always outlast a Chevy truck motor...2 perfect examples. One of my buddies back in high school drove a 74 GMC 3/4 ton 2wd pickup with a 350 4bbl in it. He went through 3 motors in that truck, two 350s and a 305. When the first motor (350) let loose it was knocking like a son of a gun, a week later it died completely. We dropped a semihealthy 305 in it but he broke that one a month later, he then put another 350 in there and sold the truck. Second example: another Chevy guy friend of mine had an 85 Chevy Suburban with a 350 in it. The engine ran sweet when he first got the truck, then one day it just mysteriously started knocking, he babied it as much as he could and it rattled for about a month until it put two rods through the oil pan. Okay now heres two examples for Ford, both were 300 inline sixes. First one, my 84 F150 4wd, I was racing someone on the highway one night, my engine was already not in the best mechanical condition (knocked). Suddenly my oil pressure dropped to nothing and it started knocking really bad. It turns out I spun the no. 5 rod bearing out, I continued to drive the truck hard for several months like this. I later decided to go ahead and rebuild it, it has almost 75k on the rebuild now and still as strong as it was when it was new. Another Ford example, a buddy of mine had a cousin who owned a 78 Ford F100 he dropped a not-so-healthy 300 into it to have something to drive. He beat on that truck hard mercilessly! The motor knocked when he put it in to begin with, it was knocking really bad one day and finally locked up after putting a rod through the pan. He towed it home, drained the oil and dropped the pan, removed what was left of the rod, put a used oil pan on it, filled it back up with oil and drove it for another half a year on 5 cylinders until he DROVE it to the junkyard. Chevy motors are sweet until they start knocking, but they die fast once something breaks inside.