Will a 97 350 Chevy truck exhaust manifolds fit on 94 truck?

Likely, but not guaranteed. While both are Chevy 350 trucks from a similar era, there's a small chance of differences in the engine block or mounting points between a 1994 and a 1997 model year. The best way to be sure is to:

* Visually compare the manifolds: If you can get a good look at both sets of manifolds, compare their bolt patterns and the overall shape. Significant differences would suggest incompatibility.

* Check the part numbers: If you have the part numbers for both sets of manifolds, you can research them online to see if they are listed as compatible with both year trucks.

* Consult a parts catalog: Use a parts catalog (like a Chilton's or Haynes manual, or an online parts website) specific to those years and models of Chevy trucks. This will give you the most accurate information on compatibility.

Don't assume they'll fit just because they're both 350s from similar years. A small difference in casting or design could prevent them from working.