Meand my cousin built a 472ci a few years back. I think that was the cubes about 15 years ago it had a 454 block with extremely rare heads that were according to the machine shop, hi flow factories. The guy offered to give him a set of Aluminum in exchange but my cousin wouldn't have it. We put studs in everything and the engine is still running strong, never been torn apart since it was built in 92. I was 14 at the time.