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The pistons used in the 4.3 L V8 were the same as the Vortec 5000's, but longer 5.94 in (150.9 mm) connecting rods were used to compensate for the shorter stroke. The L99 featured updated Generation II block architecture, and is externally identical to the larger 5.7 L LT1 Generation II V8.
The mechanical supercharger compressor, driven at 5 times the speed of the crankshaft, mainly operates at low engine speeds from idle up to 2,400 revolutions per minute (rpm) to increase low-end torque. At engine speeds just above idle, the belt-driven supercharger provides a boost pressure of 1.75 bar (25.4 psi).
LSX376-B15 (part number 19299306) includes forged steel crankshaft, forged powdered metal I-beam rods (both the crankshaft and rods from the LSA engine), forged aluminum pistons (9.0:1 compression), and high-flow rectangular-port six-bolt LSX-LS3 heads for supercharged and turbocharged combinations producing up to 15 psi (1.0 bar) of boost and ...
In 1968, the small-block Ford stroke was increased from 2.87 in (72.9 mm) to 3 in (76.2 mm), giving a total displacement of 4,942 cc (4.9 L; 301.6 cu in). The connecting rods were shortened to allow the use of the same pistons as the 289. The new 302 replaced the 289 early in the 1968 model year.
The car is powered by a supercharged LT5 V8 engine that produces 755 horsepower and 715 foot pounds of torque with high octane fuel and high density air. The car has a top speed of 217 MPH without the rear wing from the factory, and is the most powerful Corvette ever made. The car has the biggest throttle bodies, coming in at 95mm in diameter.
This makes hypereutectic pistons a better choice for stock engines, where longevity is more important than ultimate performance. Some vehicles do use forged pistons from the factory. Dodge Vipers used forged pistons from 1992-1999 model years, then switched to hypereutectic. The last generation of Vipers (2013-2017) used
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