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In mid-1983, GM introduced the L69. The L69 is the H.O. engine you are talking about. The L69 is an upgraded version of the LG4 but with flat topped pistons, a better camshaft, two air intake snorkels, a wider exhaust system, the wider catalytic converter from the Corvette, a 9.5:1 compression ratio instead of 8.6:1, richer secondary metering rods, blah blah blah... I think you get the point. It was only offered in 1983, 1984, limited production in 1985, and 74 made for racing in 1986, but 11 were made for the public.
If you read my sig, details, and username you can tell I have one.
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 Light Blue Metallic 1985 IROC-Z L69 with Grey Interior. It's rare and legendary.  |