I was wonder if anyone has bored and stroked a 454 and had it passed the California Smog Sniff Test. I have to rebuild my engine out of my 1980 C3500. We believe it’s a cracked head casket. Since we are pulling the engine and taking the heads off I might as well do the bottom end since I am right there. I would like to put a Mild to RV Cam in. Possibly make it a roller cam and roller lifters. I just don’t know if it would pass the sniff test. How far can you go before it fails the sniff test?