* Same Engine Type: The engines *must* be the same type. A 4.3L V6 from a 1995 will likely fit a 1996, but a 6.5L diesel from a 1995 won't necessarily be a direct swap into a 1996 that originally had a 4.3L. You need to verify the exact engine code (found on a tag on the engine itself) matches or is a known compatible replacement.
* Minor Differences: While the chassis and engine bay are very similar between the years, there might be minor differences in wiring harnesses, mounting brackets, or sensors. You might need to adapt some parts or use components from the 1996 Blazer.
* Automatic vs. Manual Transmission: The transmission must also be compatible. An engine from an automatic transmission Blazer won't directly swap into a manual transmission Blazer and vice-versa.
* Emissions: Depending on your location, emissions regulations may be a concern. Using a significantly older engine might not meet current emission standards.
In short, while it's *likely* to fit, you cannot assume compatibility. You need to verify the specific engine codes of both vehicles to ensure they are a match. Consult a repair manual or a parts specialist familiar with these vehicles for absolute certainty before undertaking the swap.
