Anybody know if this would or ever has passed California smog ?
ah, good luck with that.
It pretty much goes against every smog rule I can think of.
It MIGHT be possible to get it past a referee if it actually blows clean, but getting there will be an uphill climb to say the least, if it's even possible.
Let's see:
non stock motor
motor from a different brand
not even an automotive motor
(yeah, I know Mercs are just GMs underneath, but the 502 was never offered in a road vehicle and as a Merc it never had to meet any smog rules)
should I go on?
As the owner of a Merc 502 Mag, they are pretty stout but they have plenty of shortcomings compared to a modern motor. For example, the stock injection doesn't even use an O2 sensor, for feedback (too hard to do in a marine wet exhaust that didn't have/need a cat) so it's pretty limited compared to what aftermarket/modern systems can do.
But let me be clear, I'm not knocking the truck. It's pretty bad-***. Just not kosher for CA.