articfriends

iTrader: (1)

I don't know anything about the 496ho but i can tell you that the 454 mag and 502 mag longblocks are off the shelf gm H.O crate motors with no internal differences except smaller cams from what gm used to sell. From gm they are rated at 450hp/425hp respective to their sizes. A 454ho usually makes 435-438hp on dyno with headers and carb,Smitty