I believe Mueller agrees with this, as he refers to the LJ2 as the tri-carb L71 replacement various times, with the possibility of an L89/LJ2 connection only once. All considerations point to LJ1 as the 454 replacement engine for the L68 and the LJ2 as the equivalent of the L71. However, I don't think this is a likely scenario because aluminum heads were not a popular option, and the trend at GM was to get rid of costly low production options. Mike Mueller, in his book Classic Corvette-The First 30 Years, mentions the possibility that the LJ2 was the 454 equivalent of the 427 L89 engine, which would make the LJ1 the 454 equivalent of the L71. The pulley configuration will put us a pinch under 10 psi of boost to meet our power goals. Looking at RPO codes for 454 engines, it becomes obvious the slot for LJ1 is right after LS5. As you can see in these pictures, the F2 kit includes ProCharger’s beautifully-polished big block Chevy bracket system, the before-mentioned F-2 supercharger, and cog drive crank pulley. This is logical because a '70 Corvette assembly manual shows a 400hp LJ1 engine getting the same M40A Hydramatic transmission as the 390hp LS5, thereby classifying both on the lower performance end of hydraulic lifter big-block engines. The Chevrolet Chevy II/Nova is a small automobile manufactured by Chevrolet, and produced in five generations for the 1962 through 1979, and 1985 through 1988 model years.Nova was the top model in the Chevy II lineup through 1968. *It is assumed LJ1 was the 454 replacement for the 427 Tri-power, 400hp L68. We have already established that the L72 made 450 gross hp, and Chevrolet maintained a 10hp difference between Tri-power and four-barrel-equipped 427 and 454 engines. Langdon's statement that a 454 developed more torque but the same horsepower as an equivalent 427 is the basis for assuming that the L71 and LJ2 made equal power. It most likely made the same 460 SAE gross hp that LJ2 was to be rated. Pastel Supernova stock photos are available in a variety of sizes and formats to fit your needs. However, that 435 rating was not the peak horsepower that the L71 actually produced. Browse Getty Images’ premium collection of high-quality, authentic Pastel Supernova stock photos, royalty-free images, and pictures. ![]() Along with flowing more air, Tri-power provided a more efficient flow to the cylinders, all of which resulted in 10 more horsepower. This triple-carb setup gave the L71 an official rating of 435 hp at 5,800 rpm. The L72 had one Holley four-barrel flowing 780 cfm, and the L71 had three Holley two-barrel carburetors capable of feeding the engine at 1,000 cfm. The only difference between the two engines was carburetion. ![]() We have determined that the L72 engine had a true rating of 450 (SAE gross) and 345 (SAE net) hp.
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