NO, it is NOT illegal to put an older engine in a newer vehicle.joe swinehart said:it is illegal to put and older engine into a newer vehicle. federal law.
how many times is it enforced? i dunno, but i doubt it ll fly in cali.
The federal law, from what I have read on it, says you can not tamper with emissions equipment, and it goes a bit farther to say that the emissions equipment for whichever is newer, chassis or engine, must be in intact and functional.
The problem is, you must have ALL emissions equipment in place and working for which ever is newer...the chassis, or the engine.
So, if you put a 68 engine in a 98 truck, it must have all emissions equipment for the 98 truck chassis installed on the engine/chassis and working...and the reverse is true...if you put a 98 engine in a 68 body, the emissions equipment that was on the 98 engine/chassis must be in place and working on the 68 body.