What happened, Corvette?

RustyRatRod said

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.

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True, but that was the intended engine, that never went into production. And yes, they were offered over the counter.

http://www.ehow.com/list_7617778_gm-1970-ls7-454-specs.html

Several stories as to why they weren't produced, one being they had a problem with the aluminum heads, others because of insurance, and emissions. I remember reading an article in Hot Rod about both engines when I was a kid.