Engine varification
 

I puschased a 1969 rsss from an owner of the last 30 years. Said he had a dealer purchased an LS 7 with a receipt. Trying to run numbers the block stamp on the passenger side front is blank and the engin stamp on driver side by oil filter is as pictured.. please help !![img]blob:https://camaroforums.com/d99203eb-9321-45ae-a3f9-adc3feb4937a[/img]

The LS7 was an LS6 with alum. heads and tri power concept engine for the 70 Vette, but never happened. No assembled engines were sold by Chevy. I couldn't get your link to work.

True that but it was available as a crate engine less intake and carbs.GM part #3965774
Collector Car Corner: Solving a Chevy LS7 454 engine mystery | The Spokesman-Review

A friend put one in a '70 Camaro back in the mid '70's,it was badass!

Chevy sold 3965774 under the heading: Engine Asm. 454 HD, Partial (Less Manifolds, Distr. & Clutch). No mention of LS7. This engine is 12.5 to 1 with iron heads, The LS7 concept engine for the 70 Vette had 11.25 to 1 with a HP rating of 465.
I read that link you posted: "This LS7 engine was supposed to be the successor of the potent LS6, 425-horse Chevy engine that appeared in the 1970 Chevelle LS6 454" That should read 450-horse.