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The Vortec 5700 L31 (VIN code "R") is a 5.7L V8 truck engine. It is Chevrolet's last production first-generation small-block. The cylinder heads feature combustion chambers and intake ports very similar to those of the LT1 V8, but lacking the LT1's reverse-flow cooling and higher compression.
The 90° V6 engine uses the same transmission bellhousing pattern as the Chevrolet small-block V8 engine. The oil pan dipstick is located on the passenger side above the oil pan rail; this design was phased in on both the 90° V6 and Small Block Chevrolet assembly lines (for engines manufactured after 1979) sharing the same casting dies.
The Chevrolet small-block engine refers to one of the several gasoline-powered vehicle engines manufactured by General Motors. These include: The first or second generation of non-LS Chevrolet small-block engines; The third, fourth, or fifth generation of LS-based GM engines; The Chevrolet Gemini small-block engine
Starting around 1925 engine blocks and cylinder heads were now developed at each brand but were cast at Saginaw Metal Casting Operations. [3] In the mid-1960s, there were 8 separate families of GM V8 engines on sale in the USA. [4] [1] By the 1970s, GM began to see problems with their approach.
1992 saw the second generation of Chevrolet small-block hit the market in that year's Chevrolet Corvette in the form of the LT1 small-block. It featured a new ignition system , reverse-flow cooling (cooling the cylinder heads first), and new engine block, but the valvetrain and engine mounts were carried over in order to maintain a degree of ...
[citation needed] This head was designated as "0331" in the casting number. Early 0331 heads are prone to cracking, causing coolant to contaminate the oil, which can lead to catastrophic engine failure. The head cracks in the center between #3 and #4 cylinders. The crack is usually discernible with the valve cover removed as a "milky" tan line.
There were other major differences between the Turbo-Thrift engine and the Stovebolt: Bore spacing matches the Chevrolet small-block V8's 4.4 inches,; Stroke of the 194 and 230 engines is the same 3 + 1 ⁄ 4 in (82.6 mm) as the 327 small-block and 348 big-block V8s
All-new cylinder block casting; All-new cylinder head castings; Strengthened connecting rods; Forged steel crankshaft; Continuously variable valve timing; Large 38.3 mm (1.51 in) intake valves and 30.6 mm (1.20 in) sodium-filled exhaust valves; Machined, domed aluminum pistons with top steel ring carrier for greater strength; 10.2:1 compression ...