What happened, Corvette?

'73red-duster said
That was the LS7 version, which supposedly never made it into production. IIRC it had aluminum heads and a different intake. I remember reading an article about it in Hot Rod when I was a kid. I think it dyno'd at 600 hp.

Negative. The LS7 never came in a production car. It was an over the counter only engine. The LS6 was the 450/460 HP engines. The LS6 had iron heads.