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However, hypereutectic pistons experience less thermal expansion than forged pistons. For this reason, hypereutectic pistons can run a tighter piston to cylinder clearance than forged pistons. This makes hypereutectic pistons a better choice for stock engines, where longevity is more important than ultimate performance.
The interchangeable parts include the rotating assembly (crank shaft, pistons, connecting rods, and flywheel/flex-plate) one piece rear main seal housing, oil pan and valve cover gaskets and valvetrain assembly (not including timing set, which includes a gear to drive the water pump). The LT1 uses a new engine block, cylinder head, timing cover ...
The forged pistons were changed to flat-top style and the heads to open chamber heads, but retained the same large ports, valves, and adjustable valve train used in 1971. [5] This resulted in a compression ratio decreased to 9.2:1 while the cleaner-burning open-chamber heads helped meet the new emissions regulations. [1]
For the first time in a Subaru engine, the centerlines of the cylinder bores do not intersect with the crankshaft axis to reduce friction during the piston downstroke; instead, there is a crank offset of 8 mm (0.31 in). Overall thermal efficiency is 40% due to the adoption of lean-burn combustion with an excess air ratio (λ) of 2. [32]
Chrysler increased the bore size of the 383 to create the 400. Its bore of 4.342-inch (110.3 mm) was the largest used in any production Chrysler V8 at the date of its introduction. All parts except for the pistons were interchangeable between the 383 and 400. Crankshafts were made of cast iron.
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.
Piston stroke: 75 mm (2.95 in) Cylinder block material: Aluminum: Cylinder head material: Aluminum: Valvetrain: DOHC 4 valves x cyl. RPM range; Idle speed: 700±100: Combustion; Fuel system: Multi-port fuel injection: Fuel type: Gasoline LPG: Cooling system: Water-cooled: Output; Power output: 134–185 PS (132–182 hp; 99–136 kW) Torque output
The 1971 429 police interceptor was tuned similarly to the 429 Cobra Jet, with an 11.3:1 compression ratio. Featuring forged single valve [clarification needed] notched pistons the engine was rated at 370 hp (gross). [citation needed] Applications: Ford Thunderbird (1968–1973) Ford Mustang (1969–1971) Ford Mustang Boss 429 (1969–1970)
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