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Prior to the 1972 model year, American automakers rated and advertised their engines in brake horsepower, bhp, which was a version of brake horsepower called SAE gross horsepower because it was measured according to Society of Automotive Engineers (SAE) standards (J245 and J1995) that call for a stock test engine without accessories (such as ...
Ratings are in SAE gross horsepower. The front of an engine is the fan end, the rear is the flywheel end, right and left are as viewed from the rear, regardless of how the engine is mounted in the vehicle.
But SAE also allows designating an oil with two viscosity grades, referred to as a multi-grade oil. For example, 10W-30 designates a common multi-grade oil. A 10W-30 oil must pass the SAE J300 viscosity grade requirements for both 10W and 30, and all limitations placed on the viscosity grades, such as the requirement that a 10W oil must fail ...
The 304 has a displacement of 304 cu in (5.0 L), which produced 210 hp (157 kW; 213 PS)(gross rating) in 1970-71 and was built starting in 1970. [20] Output declined yearly thereafter, initially due a shift from SAE Gross to SAE Net horsepower. 1972-75 models were rated at 150 hp (112 kW; 152 PS) (net rating from 1972 onwards).
A high-performance 327 cu in (5.4 L) variant followed, turning out as much as 375 hp (280 kW) (SAE gross power, not SAE net power or the current SAE certified power values) and raising horsepower per cubic inch to 1.15 hp (0.86 kW). From 1954 to 1974, the small-block engine was known as the "Turbo-Fire" or "High Torque" V8.
Maintaining oil and coolant levels was crucial for the engine. The engine was equipped with an oil pressure switch which grounds out the primary-ignition system should the oil pressure fall below 6 psi (0.41 bar) during operation, stopping the engine and preventing it from being restarted until the oil level was replenished or the mechanical ...
The HT-HQ advertised power figures for the 253 and 308 were respectively: 185 hp and 240 hp. The SAE Gross figures for these engines was 175 hp and 227 hp. GMH Technical and Engineering literature shows these revised power figures for HJ but it took a while for it to appear in Sales literature - LX Torana release information shows the 4.2L as ...
The result was an oil system very similar to the 385 series V8s, adequate for street engines but falling short in high-revolution race use without modification. [6] The two main oil galleys in the 335 series engine run along the lifter bores. Oil is fed from the filter to the number one main bearing followed by the number one cam bearing above.
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