Hi, guys.
On the same topic, when I say "big I6" I'm thinking of the 292 because I'm guessing that the smaller I6 engines might be a little underpowered for a 1/2-ton truck, especially considering the speed and acceleration required for daily driving. Is that correct? For regular city/highway driving, is there a minimum size 6 I should be looking for? What have your experiences been?
My direct experience with the inline six stopped back in the mid 1960’s, so I’m no authority on the topic. But since I’ve liked the inline engines, I’ve tried to at least pay attention to what’s going on. In selecting a preferred displacement six, I’d consider the various sizes of the small block V8. Arguably the most popular small block V8 is the 350, and more recently the 383 stroker. But when I was young the 265, 283, and 327 were every bit as popular for family cars or hot rod engines. For a daily driver, I think any of the 230/250/292 family would provide enjoyable service. It just needs to be bolted to a transmission and rear axle that are well matched to the torque curve of the engine.
From what I remember (don’t’ take it as gospel) the 230 family shares many V8 components, like pistons, rods, and much of the valve train. They also have seven main bearings compared to only four in the 235 series engines. These are smooth running, long lasting engines that can produce great power - with enough money. The following Wikipedia article explains the lineage:
http://en.wikipedia.org/wiki/Chevrolet_Straight-6_engineHopefully another member with more experience with the 230/250/292 engines will provide some first hand input.
