What happened, Corvette?

rod440 said
The 390 horse motor in the '70 Corvette was the hydraulic lifter LS 5.They didn't have the LS 6 emissions certified in the Corvette in time for production,or something like that,so the Corvette didn't get the LS6 till '71.

That's probably spot on. I knew that was a big jump from 390 to 425 or 450. I was lookin at it like huh?

To me, the LS5 was the better, more reliable street engine.