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Message: <blockquote data-quote="99Sierra2500" data-source="post: 25568" data-attributes="member: 12343">Smeding is a top notch company, I'd trust them 100%. The shortblocks look killer, the 427 at 1300hp, might need to be tamed for the street. Though the 408 is advertised at 1000hp also. I am not sure which is better to go with the 58 or 24, I think the 58 is better overall, except it might not make that big of a difference.I am always looking at what is available. I have built turbo engines in the past, though usually four cylinder. A nice dependable naturally aspirated 600hp is pretty cool. The LSX454 looks like it is over 2x what the LS364/450 regular performance crate from Chevy Performance at $7,285.07 <a href="https://www.gmperformancemotor.com/parts/19434650.html" target="_blank">https://www.gmperformancemotor.com/parts/19434650.html</a> Catalog info <a href="https://core-marketing-communications.dcatalog.com/v/2025-Chevrolet-Performance-Catalog/?page=56" target="_blank">https://core-marketing-communications.dcatalog.com/v/2025-Chevrolet-Performance-Catalog/?page=56</a></blockquote>