Are engine swaps illegal?

Is it illegal to put a different engine in a car?

An engine change involves swapping a car engine with another that is not identical, under California law. The state insists that the newly-installed block must be the same age or newer than the one coming out of the car. It must be from the same type of vehicle, such as a passenger car or light duty truck.

The California smog laws on engine swaps (or engine changes) are consistent with common sense, safety, and emissions reduction. The EPA recognizes California smog laws as being applicable across the nation. That is, if it is legal in California, then according to the EPA, it is legal in all other states.

The most common engine replacement involves replacing a gasoline engine in a light-duty vehicle with another gasoline engine. … If the vehicle chassis in question has been certified with gasoline, as well as diesel engines(as is common), such a conversion could be done legally.

Is it cheaper to rebuild or replace an engine?

A scheduled overhaul is almost always less expensive than a new engine. Rebuilding to repair is usually cheaper than buying a new engine, too. You may save up to half of the cost of a new engine by rebuilding. However, sometimes rebuilding is not a good option.

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Can you swap a v4 for a V6?

You can. Unless the car has super small engine bay. But it should be avoided in most cases. Even in the situation where car was offered with both 4-cyl and v-6 version, differences can be quite complex.

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