[Chevy454]

4800? That's seems awfully low to me. I'm thinking my LS-6 peaked around 5300-5500, while my L-72 peaked at 5800...both of these numbers are through exhaust manifolds. (Edit: I found my dyno sheet and the LS-6 peaked at 5400.)

That dyno test in MCR has always bothered me, because a the square port BBCs should ALWAYS be able to equal their displacement in horsepower, even through manifolds. My LS-6 and L-72 did, as have Pete and JJ's engines. And Moparts can vouch for my L-72, as he walked me through building it...there's nothing trick about that thing! Not that we couldn't, but we didn't. I see no reason an LS-6 shouldn't be over the 450hp mark through manifolds (on an engine dyno of course). That would be 1hp per cube, which is pretty conservative. An interesting side note is that Jensen is running his full smog setup and dated wires on his LS-6.

Rick: I've heard you speak of this book before, but have NEVER seen one! I'd love any info you'd care to share.