[BMiles2112]

It's an Inline-5, not V-5, with 3.5L displacement. It has more HP, but less torque than your 4.3L V6. Unloaded, it should give you better mileage than the 4.3. Loaded down, I would expect the numbers to more comparable. The engine has the same bore x stroke as the Inline-4 2.7L, and the Inline-6 4.2L. All three are basically the same engine, with different #’s of cylinders. Hope this helps.

[Arrowhead1952]

The Colorado was a huge disappointment compared to the S-10,

It has more HP, but less torque than your 4.3L V6.

Thanks for the help. With the previous replies that reference valve problems, I think I'll try to find another PU with a 4.3, rather than the 5 cyl. I remember working on the in line 250 and 292 CU IN engines and we called those "hot water sixes" back in the 70's.