Factory Options (Easiest Swaps):
* 4.3L Vortec V6: This was a very common engine in this generation Blazer. Finding a replacement is relatively easy and straightforward.
* 5.7L Vortec V8: A more powerful option also available in the '98 Blazer. Swapping one is more involved than the 4.3L but still relatively common.
Potential Swap Engines (More Difficult):
Numerous V6 and V8 engines from GM and other manufacturers *could* theoretically be swapped in, but this becomes significantly more complex and requires extensive fabrication, wiring, and potentially computer programming. Factors to consider include:
* Engine Bay Space: The Blazer's engine bay has limitations. Larger engines might not fit without significant modifications.
* Transmission Compatibility: You'll need a transmission that's compatible with both the new engine and the Blazer's transfer case (if it's 4WD). This often requires an adapter or a complete transmission swap.
* Wiring Harness and Computer: The engine's computer needs to communicate with the Blazer's systems. This can require custom wiring harnesses or aftermarket engine management systems (which adds cost and complexity).
* Driveshafts and Axles: Depending on the engine's power, the existing driveshafts and axles might not be strong enough.
* Exhaust System: A new exhaust system will almost certainly be needed.
* Legal Compliance: Modifying your vehicle's engine significantly might violate emissions regulations in your area, requiring expensive and potentially impossible inspections and modifications to comply.
Examples of Potentially Swappable Engines (with significant work):
* LS Series Engines (GM): Popular choices for swaps due to their power and relatively good availability of parts. However, fitting them requires a lot of custom work.
* Other GM V8s: Many other GM V8s *could* fit, but again, the level of difficulty is high.
* Small-Block Chevrolets (SBCs): Another classic choice, but again requires a high level of fabrication skill.
In short: While swapping engines is possible, it's not a simple bolt-in process for anything beyond replacing a 4.3L with another 4.3L or maybe a 5.7L Vortec. It requires significant mechanical expertise, fabrication skills, and potentially considerable expense. Unless you have significant experience, it's best left to professional mechanics specializing in engine swaps.
