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Outboard sizes range from 2.5 horsepower (1.9 kW) to 600 horsepower (450 kW). MerCruiser sterndrives and inboards range from 135 to 430 horsepower (320 kW) and Mercury Racing outboards produce up to 450 horsepower (340 kW) and sterndrives to 1,750 horsepower (1,300 kW).
The addition of EFI and picking up the Vortec 7400 name took place in 1996 which was replaced with the Vortec 8100 platform once the 7400 was retired. Chevrolet Performance released the 454 again in 2011 as a small-block crate engine dubbed the LSX454R officially rated at 776 horsepower at 7,000 rpm and 649 lb-ft of torque at 5,100 rpm.
Vortec is a trademarked name for a line of gasoline engines for General Motors trucks.The name first appeared in an advertisement for the 1985 model year 4.3 L V6 that used "vortex technology" to create a vortex inside the combustion chamber, creating a better air / fuel atomization. [1]
It used an EFI system with electronically controlled injectors, which were mated to a twin barrel "carburetor" body. It featured "swirl port" heads (helped emissions, but severely stunted power output) and served as the base V8 engine in all C/K 1500 Series and 2500 Series (under 8,500 lbs GVWR) GMC/Chevrolet trucks and vans.
The EFI 327 was rated at 288 hp (215 kW; 292 PS) and the regular four-barrel carbureted model at 255 hp (190 kW; 259 PS). [15] The EFI system in the Rebel was a far more-advanced setup than the mechanical types then appearing on the market and the engines ran fine in warm weather, but suffered hard starting in cooler temperatures. [ 13 ]
The firing order of older big-block engines is 1-8-4-3-6-5-7-2 [63] while Vortec 8100's firing order is 1-8-7-2-6-5-4-3. Other upgrades of Vortec 8100 include a new 18-bolt head bolt pattern, longer connecting rods, different symmetrical intake ports, different oil pan rails, and the use of metric threads throughout the engine.
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