What was the highest horsepower rated 427 Corvette engine made in the 1960's?

Question

I know the L88 produced up to 435 HP, but was there a "race only" version Vette offered with no radio or heater that produced 465 HP ?

Answer 1

It seems as though the L-71 was the 435 horsepower engine but the L-88 horsepower was downplayed and determined at 5,200 rpm. The actual horsepower was 560. Read the story below:

http://www.sportscarmarket.com/profiles/2002/February/American/index.html

Answer 2

In 1965 the 396 cid/425 hp V-8 became an option for Sting Ray buyers. This big-block high-torque monster did very well both on the strip and the street, but lasted only one year in production before it was replaced by the even bigger 427 cid V-8 in 1966. Several different variations of this legendary engine were used, with the base horsepower rating at 390, while two different figures were published for the high performance versions, first at 450 hp, and later down-rated to 425. (While the reason for this is unclear today, it has been speculated it was done to help lower exhorbinant Corvette insurance rates, but this is suspect as well).

Answer 3

1968 chevy produced a aluminum 427 rated at 535 hp very limited production

Answer 4

search from here:http://en.wikipedia.org/wiki/Chevrolet_Big-Block_engine